A112613 Related to enumeration of branched orientable surface coverings over a non-orientable surface.

1, 5, 24

Offset

1,2

Comments

See reference for more information.

Links

Table of n, a(n) for n=1..3.

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: A120660 A110720 A200822 * A305057 A333633 A222355

Adjacent sequences: A112610 A112611 A112612 * A112614 A112615 A112616

Keyword

nonn,bref

Author

N. J. A. Sloane, Dec 23 2005

Status

approved