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A309564
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Shifts left by 3 places under series reversion.
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2
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1, 1, 1, 1, -1, 1, -1, 3, -15, 59, -189, 567, -1863, 7141, -29817, 125919, -528329, 2238303, -9769917, 44312225, -208177669, 1005840685, -4972561375, 25105651267, -129470605611, 682486916465, -3678964401327, 20276967904907, -114199064797229, 656666370592173
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OFFSET
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1,8
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COMMENTS
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Series reversion of the g.f. gives the same sequence with three initial terms (1, 1, 1) dropped.
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LINKS
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FORMULA
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G.f. satisfies A((A(x) - x - x^2 - x^3)/x^3) = x.
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MATHEMATICA
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Nest[InverseSeries[#] x^3 + x^3 + x^2 + x &, x + O[x]^2, 10][[3]]
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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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