A136503 Column 2 of triangle A136502.

1, -4, 26, -308, 6959, -306888, 26732904, -4628215312, 1597488685120, -1101039613155676, 1516536435306750724, -4175994577753360618608, 22993788379965461938093352, -253190775338116964702467771168

Offset: 0

Author

Paul D. Hanna, Jan 01 2008

Keywords

• sign

Crossrefs

Cf. A107354 (column 0 of A136502).

Programs

PARI

{a(n)=local(M=matrix(n+3,n+3,r,c,binomial(2^(c-1),r-c)));(M^-1)[n+3,3]}

Formula

G.f.: 1 = Sum_{n>=0} a(n)*x^n*(1+x)^(2^(n+2)).