OFFSET
1,2
REFERENCES
R. P. Stanley, Enumerative Combinatorics, Cambridge, Vol. 2, 1999; see Problem 5.20, G^<-1>(x).
MAPLE
seriestoseries(G, 'revogf'); # where G is e.g.f. for A053549; i.e. use ordinary reversion on the e.g.f. and treat answer as another e.g.f.
CROSSREFS
KEYWORD
sign
AUTHOR
N. J. A. Sloane, Jan 16 2000
STATUS
approved