OFFSET
0,2
COMMENTS
See reference for precise definition.
REFERENCES
Liskovets, Valery A. A reductive technique for enumerating non-isomorphic planar maps. Discrete Math. 156 (1996), no. 1-3, 197--217. MR1405018 (97f:05087) (See Q'_1(n).)
CROSSREFS
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Jun 03 2012
STATUS
approved