OFFSET
0,5
FORMULA
G.f. A(x) satisfies: A(x) = 1 / (1 - x * A(-2*x^2)).
MATHEMATICA
a[0] = 1; a[n_] := a[n] = Sum[(-2)^k a[k] a[n - 2 k - 1], {k, 0, Floor[(n - 1)/2]}]; Table[a[n], {n, 0, 35}]
nmax = 35; A[_] = 0; Do[A[x_] = 1/(1 - x A[-2 x^2]) + O[x]^(nmax + 1) // Normal, nmax + 1]; CoefficientList[A[x], x]
CROSSREFS
KEYWORD
sign
AUTHOR
_Ilya Gutkovskiy_, Feb 28 2022
STATUS
approved