A113371 Column 1 of triangle A113370, also equals column 0 of A113370^4.

1, 4, 28, 326, 5702, 136724, 4226334, 161385532, 7378504140, 394404094270, 24193638303234, 1677962100799727, 129990908689219749, 11135889051081255518, 1046032727101344902679, 106966601176207198837104

Offset

0,2

Comments

Column k of A113370 = column 0 of A113370^(3*k+1) for k>=0.

Links

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

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[n+2, 2]

Crossrefs

Cf. A113370, A113372 (column 2), A113373 (column 3).

Sequence in context: A332097 A358072 A198513 * A280570 A080636 A223887

Adjacent sequences: A113368 A113369 A113370 * A113372 A113373 A113374

Keyword

nonn

Author

Paul D. Hanna, Nov 13 2005

Status

approved