A113083 Diagonal of square table A113081; also, a(n) equals the n-th term in column 0 of the matrix (n+1)-th power of triangle A113084.

1, 2, 21, 724, 75695, 23694838, 22239639177, 62747494950248, 532868670719193651, 13624738004791751175370, 1048678107774203901392276461, 242892250870416811233766661498812

Offset

1,2

Links

Table of n, a(n) for n=1..12.

Prog

(PARI) {a(n, q=3)=local(M=matrix(n+1, n+1)); for(r=1, n+1, for(c=1, r, M[r, c]=if(r==c, 1, if(c>1, (M^q)[r-1, c-1])+(M^q)[r-1, c]))); return(if(n<1, 0, (M^n)[n, 1]))}

Crossrefs

Cf. A113081, A113084.

Sequence in context: A015209 A342267 A376689 * A174964 A210830 A139164

Adjacent sequences: A113080 A113081 A113082 * A113084 A113085 A113086

Keyword

nonn

Author

Paul D. Hanna, Oct 14 2005

Status

approved