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 A309254 Shifts left by 2 places under series reversion. 3
 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 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,7 COMMENTS Series reversion of the g.f. gives the same sequence with two initial terms (1, 1) dropped. LINKS Table of n, a(n) for n=1..29. FORMULA G.f. satisfies A((A(x) - x - x^2)/x^2) = x. MATHEMATICA Nest[InverseSeries[#] x^2 + x^2 + x &, x + O[x]^2, 14][[3]] CROSSREFS Cf. A067145, A309564. Sequence in context: A282321 A031389 A178495 * A360154 A217624 A097991 Adjacent sequences: A309251 A309252 A309253 * A309255 A309256 A309257 KEYWORD sign AUTHOR Vladimir Reshetnikov, Aug 07 2019 STATUS approved

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Last modified July 18 06:54 EDT 2024. Contains 374377 sequences. (Running on oeis4.)