A113383 Column 2 of triangle A113381, also equals column 0 of A113370^8.

1, 8, 120, 2556, 71548, 2508528, 106427700, 5323786728, 307710142888, 20222341451124, 1491479257952300, 122128352186849366, 11002901720698439826, 1082337197005046142588, 115485905212456384697750

Offset

0,2

Links

Table of n, a(n) for n=0..14.

Formula

Column k of A113381 = column 0 of A113370^(3*k+2) for k>=0.

Prog

(PARI) a(n)=local(A, B); A=Mat(1); for(m=2, n+2, 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^(3*j-2))[i-j+1, 1])); )); A=B); (A^8)[n+1, 1]

Crossrefs

Cf. A113381, A113375 (column 0), A113382 (column 1), A113370.

Sequence in context: A151834 A007762 A211825 * A218671 A045754 A339201

Adjacent sequences: A113380 A113381 A113382 * A113384 A113385 A113386

Keyword

nonn

Author

Paul D. Hanna, Nov 14 2005

Status

approved