A132869 - OEIS

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

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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