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A112616
Related to enumeration of branched orientable surface coverings over a non-orientable surface.
0
1, 9, 57, 847, 15303
OFFSET
1,2
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: A102303 A231310 A009060 * A197673 A012089 A343133
KEYWORD
nonn,more
AUTHOR
N. J. A. Sloane, Dec 23 2005
STATUS
approved