1,1

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: A112676 A103112 A064941 this_sequence A129430 A005156 A101613

Adjacent sequences: A112609 A112610 A112611 this_sequence A112613 A112614 A112615

nonn,bref

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