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A127701
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Infinite lower triangular matrix with (1, 2, 3,...) in the main diagonal, (1, 1, 1,...) in the subdiagonal and the rest zeros.
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17
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1, 1, 2, 0, 1, 3, 0, 0, 1, 4, 0, 0, 0, 1, 5, 0, 0, 0, 0, 1, 6, 0, 0, 0, 0, 0, 1, 7, 0, 0, 0, 0, 0, 0, 1, 8, 0, 0, 0, 0, 0, 0, 0, 1, 9, 0, 0, 0, 0, 0, 0, 0, 0, 1, 10, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 11, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 12, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 13, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
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OFFSET
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1,3
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COMMENTS
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Eigensequence of the triangle = A001040 starting (1, 3, 10, 43, 225,...). [From Gary W. Adamson, Dec 29 2008]
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LINKS
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Table of n, a(n) for n=1..103.
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EXAMPLE
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First few rows of the triangle are:
1;
1, 2;
0, 1, 3;
0, 0, 1, 4;
0, 0, 0, 1, 5;
0, 0, 0, 0, 1, 6;
0, 0, 0, 0, 0, 1, 7;
...
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MATHEMATICA
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Join[{1}, Flatten[Table[Join[{PadRight[{}, n-2, 0], 1, n}], {n, 2, 15}]]] (* Harvey P. Dale, Jan 06 2014 *)
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CROSSREFS
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A001040 [From Gary W. Adamson, Dec 29 2008]
Sequence in context: A085855 A128132 A158821 * A004199 A062283 A136493
Adjacent sequences: A127698 A127699 A127700 * A127702 A127703 A127704
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KEYWORD
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nonn,easy,tabl
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AUTHOR
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Gary W. Adamson, Jan 23 2007
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EXTENSIONS
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More terms from Jon E. Schoenfield, May 26 2007
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STATUS
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approved
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