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A132866 Expansion of 1/(1-6x*c(7x)), where c(x) is the g.f. of A000108 . 2
1, 6, 78, 1308, 24942, 513876, 11148012, 250917624, 5805563310, 137233668900, 3299955883428, 80468668049160, 1985171406618156, 49458290358431688, 1242613072013591832, 31448339835422435568 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

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

FORMULA

G.f.=7/[4+3sqrt(1-28x)]. a(n)=7^n*sum((6/7)^j*j*binom(2n-j,n)/(2n-j), j=0..n) for n>=1. - Emeric Deutsch, Nov 19 2007

a(n)=Sum_{k, 0<=k<=n}A039599(n,k)*(-1)^k*7^(n-k). - Philippe Deléham, Dec 11 2007

MAPLE

g:=7/(4+3*sqrt(1-28*x)): gser:=series(g, x=0, 18): seq(coeff(gser, x, n), n=0..15); - Emeric Deutsch, Nov 19 2007

CROSSREFS

Sequence in context: A208473 A268555 A131926 * A279444 A094419 A229044

Adjacent sequences:  A132863 A132864 A132865 * A132867 A132868 A132869

KEYWORD

nonn

AUTHOR

Philippe Deléham, Nov 18 2007

EXTENSIONS

More terms from Emeric Deutsch, Nov 19 2007

STATUS

approved

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Last modified February 20 19:06 EST 2018. Contains 299382 sequences. (Running on oeis4.)