A132869 Expansion of 1/(1-8x*c(9x)), where c(x) is the g.f. of A000108.

1, 8, 136, 2960, 73000, 1941488, 54308944, 1575042848, 46933604200, 1428339725360, 44208223638256, 1387283904693728, 44037051952177936, 1411537432519587680, 45622957237070603680, 1485278571381185936960

Offset

0,2

Links

Table of n, a(n) for n=0..15.

Formula

a(n) = Sum_{k=0..n} A039599(n,k)*(-1)^k*9^(n-k). - Philippe Deléham, Dec 11 2007

Maple

c:=proc(x) options operator, arrow: (1/2-(1/2)*sqrt(1-4*x))/x end proc: G:=1/(1-8*x*c(9*x)): Gser:=series(G, x=0, 20): seq(coeff(Gser, x, n), n=0..16); # Emeric Deutsch, Dec 20 2007

Crossrefs

Cf. A000108, A039599.

Sequence in context: A195614 A358958 A131927 * A036915 A238465 A049211

Adjacent sequences: A132866 A132867 A132868 * A132870 A132871 A132872

Keyword

nonn

Author

Philippe Deléham, Nov 18 2007

Extensions

More terms from Emeric Deutsch, Dec 20 2007

Status

approved