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A085853
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Triangle T(n, k) read by rows; given by [1, 1, 1, 1, 1, 1, 1, 1, ...] DELTA [1, 0, 2, 0, 2, 0, 3, 0, 2, 0, 4, 0, 2, 0, ...] (A000005 interspersed with 0's) where DELTA is Deléham's operator defined in A084938.
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1
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1, 1, 1, 2, 3, 1, 5, 11, 7, 1, 14, 42, 42, 15, 1, 42, 162, 227, 137, 31, 1, 132, 627, 1145, 996, 408, 63, 1, 429, 2432, 5516, 6345, 3849, 1143, 127, 1, 1430, 9453, 25752, 37141, 30238, 13634, 3062, 255, 1, 4862, 36821, 117581, 205138, 211512
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OFFSET
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0,4
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LINKS
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Alois P. Heinz, Rows n = 0..140, flattened
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FORMULA
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T(n,0)= A000108(n), Catalan numbers .
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EXAMPLE
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Triangle begins :
1;
1, 1;
2, 3, 1;
5, 11, 7, 1;
14, 42, 42, 15, 1; ...
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CROSSREFS
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Cf. A000005, A000012, A000108, A000225 (first subdiagonal).
Sequence in context: A144634 A178125 A147315 * A185997 A231733 A182822
Adjacent sequences: A085850 A085851 A085852 * A085854 A085855 A085856
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KEYWORD
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nonn,tabl
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AUTHOR
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N. J. A. Sloane, Aug 16 2003
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STATUS
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approved
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