A239919 Number of unrooted maps with n edges of (orientable) genus 6.

1013582110, 169857459866, 15202559941266, 964949198577434, 48695382495936280, 2077641325234343160, 77856954571873092792, 2629247239663140056192, 81498694882848919958250, 2350709723279734060249864, 63759822591543968176310334, 1639827731755812039740785472, 40257891518670970262942165090

Offset

12,1

Links

Andrew Howroyd, Table of n, a(n) for n = 12..60

Timothy R. S. Walsh, Alain Giorgetti, Alexander Mednykh, Enumeration of unrooted orientable maps of arbitrary genus by number of edges and vertices, Discrete Math. 312 (2012), no. 17, 2660--2671. MR2935417.

Crossrefs

Column k=6 of A379438

Cf. A238356 (rooted), A348798 (unsensed).

Cf. A006386, A104595, A104596, A215019, A239918.

Sequence in context: A048939 A269120 A095733 * A384451 A020666 A074205

Adjacent sequences: A239916 A239917 A239918 * A239920 A239921 A239922

Keyword

nonn,changed

Author

Alain Giorgetti, Mar 29 2014

Extensions

a(22) onwards added by Andrew Howroyd, Jan 18 2025

Status

approved