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

Author

Paul D. Hanna, Nov 13 2005

Keywords

• nonn

Comments

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

Crossrefs

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

Programs

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]