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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
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
Sequence in context: A056409 A056399 A256927 * A074954 A103952 A103955
KEYWORD
sign
AUTHOR
Paul D. Hanna, Dec 02 2007
STATUS
approved