A113341 Column 1 of triangle A113340, also equals column 0 of A113340^3.

1, 3, 12, 69, 560, 6059, 83215, 1399161, 28020221, 654110586, 17494347067, 528556017365, 17830841841940, 665126088764191, 27208111182653865, 1211942062741823574, 58424831462907214924, 3031993693950136247986

Offset

0,2

Links

Table of n, a(n) for n=0..17.

Prog

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

Crossrefs

Cf. A113342 (column 2), A113343 (column 3), A113344 (column 4), A113340, A113360 (=A113340^3).

Sequence in context: A244610 A187007 A102078 * A125862 A077460 A001205

Adjacent sequences: A113338 A113339 A113340 * A113342 A113343 A113344

Keyword

nonn

Author

Paul D. Hanna, Nov 08 2005

Status

approved