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%I #8 Jan 27 2022 20:55:54
%S 0,1,-1,-2,2,13,-16,-161,170,2647,-1711,-51248,5711,1103710,599246,
%T -25521869,-33907174,620323849,1410745127,-15678980390,-53746958146,
%U 411344661913,1998823108706,-11256049308869,-75003366373495,323285264486686,2904292324907387
%N G.f. A(x) satisfies: A(x) = x + x * A(A(-x)).
%t nmax = 26; A[_] = 0; Do[A[x_] = x + x A[A[-x]] + O[x]^(nmax + 1) // Normal, nmax + 1]; CoefficientList[A[x], x]
%Y Cf. A030266, A030277, A171212.
%K sign
%O 0,4
%A _Ilya Gutkovskiy_, Jan 27 2022
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