A268573 Arises in counting maps on a surface: see Coquereaux-Zuber (2015) for precise definition.

0, 0, 2, 1, 4, 6, 24, 73, 322, 1274

Offset

1,3

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: A367716 A019142 A330536 * A145858 A328491 A328357

Adjacent sequences: A268570 A268571 A268572 * A268574 A268575 A268576

Keyword

nonn,more

Author

N. J. A. Sloane, Mar 03 2016

Status

approved