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Search: id:A141140
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| A141140 |
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G.f. satisfies: A(A(x)) = A(x) + A(x^2). |
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+0
1
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| 1, 1, -2, 10, -62, 466, -4004, 37774, -383042, 4120768, -46601144, 550296628, -6751738736, 85742962300, -1123702072256, 15161509999324, -210202294372118, 2989858353554554, -43572404751879032, 649889656256427742, -9911173481433673436
(list; graph; listen)
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OFFSET
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1,3
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EXAMPLE
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G.f.: A(x) = x + x^2 - 2*x^3 + 10*x^4 - 62*x^5 + 466*x^6 - 4004*x^7 +-...
A(A(x)) = x + 2*x^2 - 2*x^3 + 11*x^4 - 62*x^5 + 464*x^6 - 4004*x^7 +-...
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PROGRAM
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(PARI) {a(n)=local(A=x+x^2); for(i=0, n, A=x+subst(A, x, serreverse(A+x*O(x^n))^2)); polcoeff(A, n)}
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CROSSREFS
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Sequence in context: A092165 A107026 A107841 this_sequence A129130 A078531 A130721
Adjacent sequences: A141137 A141138 A141139 this_sequence A141141 A141142 A141143
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KEYWORD
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sign
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AUTHOR
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Paul D. Hanna (pauldhanna(AT)juno.com), Jun 10 2008
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