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A135864 G.f. A(x) satisfies: A(x) = 1 + 9x*A(x)^(1/3). 2
1, 9, 27, 0, -81, 243, 0, -2916, 10935, 0, -168399, 682344, 0, -11711385, 49364964, 0, -900438201, 3887490915, 0, -73729998576, 323480165085, 0, -6303914878248, 27978933759300, 0, -556251967191492, 2490404893915293, 0, -50276620111538700, 226626845346291663, 0 (list; graph; refs; listen; history; internal format)
OFFSET

0,2

FORMULA

a(n) = -9^n*binomial(n/3,n)/(2n/3 - 1).

PROG

(PARI) a(n)=9^n*binomial(n/3, n)/(1-2*n/3)

CROSSREFS

Cf. A135863, A135866.

Sequence in context: A084813 A056409 A056399 * A074954 A103952 A103955

Adjacent sequences:  A135861 A135862 A135863 * A135865 A135866 A135867

KEYWORD

sign

AUTHOR

Paul D. Hanna (pauldhanna(AT)juno.com), Dec 02 2007

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Last modified February 16 19:48 EST 2012. Contains 205955 sequences.