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Search: id:A153850
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| A153850 |
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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. |
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+0
5
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| 1, 2, 27, 594, 17180, 603879, 24795645, 1160887350, 60940292571, 3541938123306, 225669592036086, 15634133444509443, 1169781625911185118, 93989088711427170141, 8069678384570571946581, 737204558292074214218778
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OFFSET
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1,2
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PROGRAM
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(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)}
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CROSSREFS
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Cf. A153851, A153852, A153853, A153854.
Sequence in context: A083384 A121971 A121137 this_sequence A138458 A090248 A078102
Adjacent sequences: A153847 A153848 A153849 this_sequence A153851 A153852 A153853
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KEYWORD
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nonn
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AUTHOR
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Paul D. Hanna (pauldhanna(AT)juno.com), Jan 21 2009
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