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A268559 Arises in counting maps on a surface: see Coquereaux-Zuber (2015) for precise definition. 0
2, 3, 14, 54, 420, 3886, 46470, 645524, 10328214 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..9.

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: A188289 A153741 A070207 * A270707 A141148 A275554

Adjacent sequences:  A268556 A268557 A268558 * A268560 A268561 A268562

KEYWORD

nonn,more

AUTHOR

N. J. A. Sloane, Mar 02 2016

STATUS

approved

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Last modified August 8 02:45 EDT 2020. Contains 336290 sequences. (Running on oeis4.)