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A268569 Arises in counting maps on a surface: see Coquereaux-Zuber (2015) for precise definition. 0
0, 0, 1, 1, 2, 6, 19, 74, 320, 1469 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,5

LINKS

Table of n, a(n) for n=1..10.

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: A044045 A150118 A150119 * A181770 A138800 A008989

Adjacent sequences:  A268566 A268567 A268568 * A268570 A268571 A268572

KEYWORD

nonn,more

AUTHOR

N. J. A. Sloane, Mar 03 2016

STATUS

approved

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Last modified December 11 07:18 EST 2019. Contains 329914 sequences. (Running on oeis4.)