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A112616 Related to enumeration of branched orientable surface coverings over a non-orientable surface. 0
1, 9, 57, 847, 15303 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

See reference for more information.

LINKS

Table of n, a(n) for n=1..5.

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

Adjacent sequences:  A112613 A112614 A112615 * A112617 A112618 A112619

KEYWORD

nonn,more

AUTHOR

N. J. A. Sloane, Dec 23 2005

STATUS

approved

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Last modified May 23 00:47 EDT 2022. Contains 353959 sequences. (Running on oeis4.)