A136468 Column 1 of triangle A136467 (scaled): a(n) = A136467(n+1,1)/2^n.

1, 2, 8, 106, 4728, 697288, 341056672, 561635549128, 3172355531357504, 62573893999774791616, 4377792727679018712191744, 1100465546170585425117622597248, 1004426091768772936789017838438890496

Offset: 0

Author

Paul D. Hanna, Dec 31 2007

Keywords

• nonn

Crossrefs

Cf. A136467; A136469.

Programs

PARI

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