A132627 Column 1 of triangle A132625.

1, 1, 4, 60, 2960, 454072, 216266368, 328381917376, 1646431825247488, 28147649085162289088, 1682689316516069630268928, 358405429181246295625283815424, 275845379756819156941815068510302208

Offset

0,3

Comments

Triangle T=A132625 is generated by matrix powers of itself such that row n+1 of T = row n of T^(2^n) with appended '1' for n>=0 with T(0,0)=1.

Links

Table of n, a(n) for n=0..12.

Prog

(PARI) {a(n)=local(A=vector(n+1), p); A[1]=1; for(j=1, n, p=2^(n+1)-2^(n-j+1)-j; A=Vec((Polrev(A)+x*O(x^p))/(1-x))); A[p+1]}

Crossrefs

Cf. A132625, A132626.

Sequence in context: A181444 A177780 A012567 * A229771 A341275 A338550

Adjacent sequences: A132624 A132625 A132626 * A132628 A132629 A132630

Keyword

nonn

Author

Paul D. Hanna, Aug 25 2007

Status

approved