A113382 Column 1 of triangle A113381, also equals column 0 of A113370^5.

1, 5, 45, 635, 12815, 343815, 11651427, 480718723, 23489845779, 1330745268401, 85944092769721, 6242138253088466, 504185328302302736, 44867722807185829082, 4364538423763543903228, 460969199012824227856506

Offset

0,2

Links

Table of n, a(n) for n=0..15.

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+1, 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^5)[n+1, 1]

Crossrefs

Cf. A113381, A113375 (column 0), A113383 (column 2), A113370.

Sequence in context: A294332 A365604 A085356 * A304919 A132688 A295227

Adjacent sequences: A113379 A113380 A113381 * A113383 A113384 A113385

Keyword

nonn

Author

Paul D. Hanna, Nov 14 2005

Status

approved