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A370801
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Expansion of (1/x) * Series_Reversion( x/(x+1/(1-x+x^4)) ).
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3
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1, 2, 5, 15, 50, 176, 638, 2351, 8735, 32523, 120707, 444218, 1611211, 5714056, 19578953, 63495983, 186784641, 442718804, 396470087, -4588483661, -45923198497, -305945783479, -1761810468901, -9395726622973, -47743575327196, -234512941253088, -1122653095777562
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OFFSET
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0,2
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LINKS
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FORMULA
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a(n) = Sum_{k=0..n} binomial(n,k) * b(k), where g.f. B(x) = Sum_{k>=0} b(k)*x^k satisfies B(x) = (1/x) * Series_Reversion( x*(1-x+x^4) ).
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PROG
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(PARI) my(N=30, x='x+O('x^N)); Vec(serreverse(x/(x+1/(1-x+x^4)))/x)
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CROSSREFS
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KEYWORD
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sign
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AUTHOR
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STATUS
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approved
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