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A153850 a(n) is the coefficient of x^n in the n-fold self-composition of G(x) = x + G(G(x))^3 = g.f. of A153851. 4
1, 2, 27, 594, 17180, 603879, 24795645, 1160887350, 60940292571, 3541938123306, 225669592036086, 15634133444509443, 1169781625911185118, 93989088711427170141, 8069678384570571946581, 737204558292074214218778 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..16.

PROG

(PARI) {a(n)=local(G=x+O(x^(2*n+1)), H=G); for(i=0, n, G=serreverse(x-G^3)); for(i=1, n, H=subst(G, x, H)); polcoeff(H, 2*n-1)}

CROSSREFS

Cf. A153851, A153852, A153853, A153854.

Sequence in context: A242009 A121137 A203429 * A138458 A090248 A300591

Adjacent sequences:  A153847 A153848 A153849 * A153851 A153852 A153853

KEYWORD

nonn

AUTHOR

Paul D. Hanna, Jan 21 2009

STATUS

approved

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Last modified October 18 03:25 EDT 2021. Contains 348065 sequences. (Running on oeis4.)