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A268557
Arises in counting maps on a surface: see Coquereaux-Zuber (2015) for precise definition.
0
2, 32, 1344, 99840, 11034624, 1646100480
OFFSET
1,1
LINKS
R. Coquereaux, J.-B. Zuber, Maps, immersions and permutations, arXiv preprint arXiv:1507.03163, 2015. Also J. Knot Theory Ramifications 25, 1650047 (2016), DOI: http://dx.doi.org/10.1142/S0218216516500474
CROSSREFS
Sequence in context: A012214 A320419 A012140 * A281183 A012209 A295418
KEYWORD
nonn,more
AUTHOR
N. J. A. Sloane, Mar 02 2016
STATUS
approved