login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A268567 Arises in counting maps on a surface: see Coquereaux-Zuber (2015) for precise definition. 0
1, 4, 42, 780, 21552, 803760, 38054160, 2194345440, 149604053760, 11794431720960 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

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: A140055 A221096 A179499 * A197866 A197948 A196194

Adjacent sequences:  A268564 A268565 A268566 * A268568 A268569 A268570

KEYWORD

nonn,more

AUTHOR

N. J. A. Sloane, Mar 03 2016

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified June 27 22:27 EDT 2022. Contains 354899 sequences. (Running on oeis4.)