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A094415
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Triangle T read by rows: dot product <r,r-1,...,1> * <s+1,s+2,...,r,1,2,...,s>.
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9
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1, 4, 5, 10, 13, 13, 20, 26, 28, 26, 35, 45, 50, 50, 45, 56, 71, 80, 83, 80, 71, 84, 105, 119, 126, 126, 119, 105, 120, 148, 168, 180, 184, 180, 168, 148, 165, 201, 228, 246, 255, 255, 246, 228, 201, 220, 265, 300, 325, 340, 345, 340, 325, 300, 265, 286, 341
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OFFSET
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0,2
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LINKS
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Table of n, a(n) for n=0..56.
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FORMULA
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T(r, s) = r[r^2 + 3r(1+s) + 2 - 3s^2], r>0, 0<=s<=r.
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EXAMPLE
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1
4 5
10 13 13
20 26 28 26
35 45 50 50 45
56 71 80 83 80 71
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CROSSREFS
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Columns 0-6 are A000292, A008778, A026054, A026057, A026060, A026063, A026066. Half-diagonal is A050410, row sums are A000537. See also A094414, A088003.
Sequence in context: A217571 A058335 A222353 * A114517 A236283 A116930
Adjacent sequences: A094412 A094413 A094414 * A094416 A094417 A094418
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KEYWORD
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nonn,tabl
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AUTHOR
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Ralf Stephan, May 02 2004
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STATUS
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approved
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