A239921 Number of unrooted maps with n edges of (orientable) genus 7.

508233789579, 104295987346126, 11269592389125547, 852994611088758224, 50777879440443305426, 2531246455428148382456, 109880399953287962099588, 4265557888300762164284822, 150940131172496245801920542, 4938911033961317567088755908, 151101665358744941452325232448

Offset

14,1

Links

Andrew Howroyd, Table of n, a(n) for n = 14..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=7 of A379438.

Cf. A238357 (rooted), A348800 (unsensed).

Cf. A006386, A104595, A104596, A215019, A239918, A239919.

Sequence in context: A364785 A209833 A255578 * A250867 A104303 A306500

Adjacent sequences: A239918 A239919 A239920 * A239922 A239923 A239924

Keyword

nonn

Author

Alain Giorgetti, Mar 29 2014

Extensions

a(23) onwards added by Andrew Howroyd, Jan 18 2025

Status

approved