OFFSET
1,4
LINKS
Vincenzo Librandi, Table of n, a(n) for n = 1..200
N. J. A. Sloane, Transforms
FORMULA
G.f. A(x) satisfies: A(x) = -1 + (1 + x) * Product_{k>=2} 1/(1 + A(x)^k). - Ilya Gutkovskiy, Apr 23 2020
MATHEMATICA
InverseSeries[QPochhammer[-1, x]/2 + O[x]^20][[3]] (* Vladimir Reshetnikov, Sep 22 2016 *)
CROSSREFS
KEYWORD
sign
AUTHOR
Christian G. Bower, Nov 15 1999
STATUS
approved