A113342 Column 2 of triangle A113340, also equals column 0 of A113340^5.

1, 5, 35, 325, 3880, 57560, 1030751, 21763632, 531604250, 14789895891, 462672349092, 16100666809097, 617634167482824, 25916099832677757, 1181568927574816310, 58194225186901919790, 3080529680131892318877

Offset

0,2

Links

Table of n, a(n) for n=0..16.

Prog

(PARI) a(n)=local(A, B); A=matrix(1, 1); A[1, 1]=1; for(m=2, n+3, B=matrix(m, m); for(i=1, m, for(j=1, i, if(i<3 || j==i || j>m-1, B[i, j]=1, if(j==1, B[i, 1]=1, B[i, j]=(A^(2*j-1))[i-j+1, 1])); )); A=B); A[n+3, 3]

Crossrefs

Cf. A113341 (column 1), A113343 (column 3), A113344 (column 4), A113340.

Sequence in context: A362356 A307679 A305306 * A262248 A346666 A369724

Adjacent sequences: A113339 A113340 A113341 * A113343 A113344 A113345

Keyword

nonn

Author

Paul D. Hanna, Nov 08 2005

Status

approved