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A309254
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Shifts left by 2 places under series reversion.
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3
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1, 1, 1, -1, 1, 1, -11, 41, -83, -77, 1621, -8503, 25689, -11283, -436307, 3380827, -15378675, 37938353, 87204085, -1755462619, 12722279385, -61250294425, 164643256457, 465385122833, -10366591960879, 88472237039417, -527994960273655, 2118908595206935, -1118896610239543
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OFFSET
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1,7
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COMMENTS
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Series reversion of the g.f. gives the same sequence with two initial terms (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^2) = x.
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MATHEMATICA
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Nest[InverseSeries[#] x^2 + x^2 + x &, x + O[x]^2, 14][[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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