cp's OEIS Frontend

This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

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A115283 Diagonal sums of correlation triangle for 3-2*0^n.

Original entry on oeis.org

1, 3, 6, 13, 18, 27, 37, 48, 60, 76, 90, 108, 127, 147, 168, 193, 216, 243, 271, 300, 330, 364, 396, 432, 469, 507, 546, 589, 630, 675, 721, 768, 816, 868, 918, 972, 1027, 1083, 1140, 1201, 1260, 1323, 1387, 1452, 1518, 1588, 1656, 1728, 1801
Offset: 0

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Author

Paul Barry, Jan 19 2006

Keywords

Comments

Diagonal sums of number triangle A115282.

Formula

G.f.: (1+2x)(1+2x^2)/((1-x)(1-x^2)(1-x^3)); a(n)=sum{k=0..floor(n/2), sum{j=0..n-k, [j<=k]*(3-2*0^(k-j))*[j<=n-2k]*(3-2*0^(n-2k-j))}}.
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