A113102 Column 1 of triangle A113101.

1, 20, 894, 108292, 39188597, 45157269264, 172969059719500, 2268555493366383236, 104065414379018585400528, 16965802042440759287849083708, 9953305892540385313201626908460431

Offset

1,2

Links

Table of n, a(n) for n=1..11.

Prog

(PARI) {a(n)=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^4)[r-1, c-1])+(M^4)[r-1, c]))); return(if(n<1, 0, (M^4)[n+1, 2]))}

Crossrefs

Cf. A113101.

Sequence in context: A291112 A362168 A192370 * A285673 A250017 A305116

Adjacent sequences: A113099 A113100 A113101 * A113103 A113104 A113105

Keyword

nonn

Author

Paul D. Hanna, Oct 14 2005

Extensions

Offset changed to 1 by Georg Fischer, Jun 20 2022

Status

approved