A136471 Column 1 of triangle A136470 (scaled): a(n) = A136470(n+1,1)/2^n.

1, 4, 32, 756, 57008, 14053392, 11549010240, 32284463059856, 312975732247964288, 10703164992206736756608, 1309922159165846642159232512, 580548577042594102886390324391168

Offset: 0

Author

Paul D. Hanna, Jan 01 2008

Keywords

• nonn

Comments

Triangle T = A136470 is defined by: column 0 of T^m = {C(m*2^n, n), n>=0}.

Crossrefs

Cf. A136470; A136472.

Programs

PARI

{a(n)=local(M=matrix(n+2,n+2,r,c,binomial(r*2^(c-1),c-1)),P); P=matrix(n+2,n+2,r,c,binomial((r+1)*2^(c-1),c-1));(P~*M~^-1)[n+2,2]/2^n}