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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A132289 Triangle, read by rows of 2n+1 terms, where T(n,k) = T(n,k-1) + T(n-1,k-1) for 2n>=k>0, T(n,2n-1) = T(n,2n-2) + T(n-1,n-1) and T(n,2n) = T(n,2n-1) + T(n-1,n-1) for n>0, with T(n,0) = T(n-1,n-1) for n>0 and T(0,0) = 1.

Original entry on oeis.org

1, 1, 2, 3, 3, 4, 6, 9, 12, 12, 15, 19, 25, 34, 46, 58, 58, 70, 85, 104, 129, 163, 209, 267, 325, 325, 383, 453, 538, 642, 771, 934, 1143, 1410, 1735, 2060, 2060, 2385, 2768, 3221, 3759, 4401, 5172, 6106, 7249, 8659, 10394, 12454, 14514, 14514, 16574, 18959
Offset: 0

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Author

Paul D. Hanna, Aug 18 2007

Keywords

Comments

Column 0 and the rightmost border (shifted right) equal A125276.

Examples

			Triangle begins:
  1;
  1, 2, 3;
  3, 4, 6, 9, 12;
  12, 15, 19, 25, 34, 46, 58;
  58, 70, 85, 104, 129, 163, 209, 267, 325;
  325, 383, 453, 538, 642, 771, 934, 1143, 1410, 1735, 2060;
  2060, 2385, 2768, 3221, 3759, 4401, 5172, 6106, 7249, 8659, 10394, 12454, 14514; ...
		

Crossrefs

Cf. A132290 (main diagonal), A125276 (column 0).

Programs

  • PARI
    T(n,k)=my(A=[1]);if(2*n
    				
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