A113391 Column 2 of triangle A113389, also equals column 0 of A113370^9.

1, 9, 153, 3621, 110637, 4176549, 188802141, 9981491997, 605817292893, 41590997891929, 3190816992548889, 270817573670371995, 25214094974302894695, 2556615042094813435491, 280570514270855698070535

Offset

0,2

Links

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

Formula

Column k of A113389 = column 0 of A113370^(3*k+3) 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^9)[n+1, 1]

Crossrefs

Cf. A113389, A113378 (column 0), A113390 (column 1), A113370.

Sequence in context: A217822 A217823 A361190 * A045755 A009037 A012148

Adjacent sequences: A113388 A113389 A113390 * A113392 A113393 A113394

Keyword

nonn

Author

Paul D. Hanna, Nov 14 2005

Status

approved