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Search: id:A120921
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| A120921 |
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G.f. satisfies: A(x) = G(x) * A(x^4*G(x)^9), where G(x) is the g.f. of A001764: G(x) = 1 + x*G(x)^3. |
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+0
4
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| 1, 1, 3, 12, 56, 283, 1503, 8262, 46591, 267984, 1565949, 9269559, 55465035, 334919996, 2038268620, 12489068727, 76980573203, 476994419698, 2969444848029, 18563305700106, 116485903375761, 733457500802353
(list; graph; listen)
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OFFSET
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0,3
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COMMENT
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Self-convolution cube equals A120920, which equals column 0 of triangle A120919 (cascadence of (1+x)^3).
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PROGRAM
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(PARI) {a(n)=local(A=1+x, G=(1/x*serreverse(x/(1+x+x*O(x^n))^3))^(1/3)); for(i=0, n, A=G*subst(A, x, x^4*G^9 +x*O(x^n))); polcoeff(A, n, x)}
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CROSSREFS
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Cf. A120919, A120920, A001764; A001764 (ternary trees).
Sequence in context: A064314 A107318 A050147 this_sequence A074533 A000257 A027390
Adjacent sequences: A120918 A120919 A120920 this_sequence A120922 A120923 A120924
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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), Jul 17 2006
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