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A171201
G.f. satisfies: A(x) = (1 + x*A(2x))^3.
3
1, 3, 21, 289, 7566, 380424, 37361616, 7252471584, 2799853666176, 2155959119115264, 3315891500224031232, 10193070293871040606464, 62646640175842537242599936, 769927299959295414569740867584
OFFSET
0,2
FORMULA
Self-convolution cube of A171200 where a(n) = A171200(n+1)/2^n for n>=0.
PROG
(PARI) {a(n)=local(A=1+x+x*O(x^n)); for(i=0, n, A=(1+x*subst(A, x, 2*x))^3); polcoeff(A, n)}
CROSSREFS
KEYWORD
nonn
AUTHOR
Paul D. Hanna, Dec 05 2009
STATUS
approved