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A132627 Column 1 of triangle A132625. 2


%S 1,1,4,60,2960,454072,216266368,328381917376,1646431825247488,

%T 28147649085162289088,1682689316516069630268928,

%U 358405429181246295625283815424,275845379756819156941815068510302208

%N Column 1 of triangle A132625.

%C 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.

%o (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]}

%Y Cf. A132625, A132626.

%K nonn

%O 0,3

%A _Paul D. Hanna_, Aug 25 2007

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Last modified February 8 08:32 EST 2023. Contains 360136 sequences. (Running on oeis4.)