A113346 Column 0 of triangle A113345, also equals column 0 of A113350.

1, 2, 5, 19, 113, 966, 10958, 156700, 2727794, 56306696, 1350043965, 36979531549, 1141573025172, 39272377323693, 1491452150268436, 62027842189908231, 2805631215820328992, 137199563717151509077, 7215932308408758314447

Offset

0,2

Comments

A113345 is the matrix square of A113340.

Links

Table of n, a(n) for n=0..18.

Prog

(PARI) a(n)=local(A, B); A=matrix(1, 1); A[1, 1]=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^(2*j-1))[i-j+1, 1])); )); A=B); (A^2)[n+1, 1]

Crossrefs

Cf. A113340, A113345, A113347 (column 1), A113348 (column 2), A113349 (column 3); A113350.

Sequence in context: A224691 A192445 A089126 * A198945 A324168 A322011

Adjacent sequences: A113343 A113344 A113345 * A113347 A113348 A113349

Keyword

nonn

Author

Paul D. Hanna, Nov 08 2005

Status

approved