OFFSET
1,4
COMMENTS
LINKS
Eric Weisstein's MathWorld, Series Reversion.
EXAMPLE
The series reversion of x + x^3 - x^5 + 4*x^7 - 24*x^9 + ... is x - x^3 + 4*x^5 - 24*x^7 + ...
MATHEMATICA
Nest[InverseSeries[#] x^2 + x &, x + O[x]^2, 30][[3, ;; ;; 2]]
CROSSREFS
KEYWORD
sign
AUTHOR
Vladimir Reshetnikov, Aug 10 2019
STATUS
approved