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Search: id:A128328
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| 1, 1, 5, 30, 200, 1435, 10900, 86799, 720074, 6196295, 55135043, 506125404, 4784680169, 46516469860, 464550190798, 4761343733469, 50044839978614, 539051253692777, 5946806890025709, 67156408547628636, 775935817487472046
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OFFSET
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0,3
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FORMULA
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G.f.: A(x) = 1 + G(G(G(G(G(x))))) = B(G(x)), where B(x) is the g.f. of A128327 and G(x) = x + x*G(G(x)) is the g.f. of A030266.
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PROGRAM
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(PARI) {a(n)=local(A=1+x, B); for(i=0, n, A=1+x*A*subst(A, x, x*A+x*O(x^n))); B=A; for(i=1, 3, B=subst(B, x, x*A+x*O(x^n))); polcoeff(B, n)}
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CROSSREFS
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Cf. A030266; A128325 (table), A128326 (row 1), A128327 (row 2), A128329 (main diagonal).
Sequence in context: A081015 A090139 A107265 this_sequence A118346 A091927 A165312
Adjacent sequences: A128325 A128326 A128327 this_sequence A128329 A128330 A128331
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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), Mar 11 2007
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