A113348 Column 2 of triangle A113345, also equals column 0 of A113350^5.

1, 10, 105, 1315, 19875, 357860, 7547602, 183518246, 5072961513, 157525315615, 5438681986872, 206954207984234, 8613936431369952, 389602050945939891, 19038814387466399303, 1000152089409979423044, 56229083214210734799693

Offset

0,2

Comments

A113345 is the matrix square of A113340.

Links

Table of n, a(n) for n=0..16.

Prog

(PARI) a(n)=local(A, B); A=matrix(1, 1); A[1, 1]=1; for(m=2, n+3, 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+3, 3]

Crossrefs

Cf. A113340, A113345, A113346 (column 0), A113347 (column 1), A113349 (column 3); A113350.

Sequence in context: A024131 A000457 A240681 * A193274 A068883 A087599

Adjacent sequences: A113345 A113346 A113347 * A113349 A113350 A113351

Keyword

nonn

Author

Paul D. Hanna, Nov 08 2005

Status

approved