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A112612
Related to enumeration of branched orientable surface coverings over a non-orientable surface.
0
OFFSET
1,1
COMMENTS
See reference for more information.
LINKS
I. P. Goulden, J. H. Kwak and J. Lee, Enumerating branched orientable surface coverings over a non-orientable surface, Discr. Math. 303 (2005), 42-55.
CROSSREFS
Sequence in context: A112676 A103112 A064941 * A129430 A005156 A355120
KEYWORD
nonn,bref
AUTHOR
N. J. A. Sloane, Dec 23 2005
STATUS
approved