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A112616
Related to enumeration of branched orientable surface coverings over a non-orientable surface.
0
1, 9, 57, 847, 15303
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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 13 12:32 EDT 2024. Contains 372519 sequences. (Running on oeis4.)