1,2

See reference for more information.

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.

Sequence in context: A002811 A120660 A110720 this_sequence A056234 A030766 A063143

Adjacent sequences: A112610 A112611 A112612 this_sequence A112614 A112615 A112616

nonn,bref

N. J. A. Sloane (njas(AT)research.att.com), Dec 23 2005