A113181 - cp's OEIS frontend

A113181 Number of unrooted two-vertex (or, dually, two-face) regular planar maps of even valency 2n considered up to orientation-preserving homeomorphism.

n	a(n)
1	1
2	3
3	14
4	95
5	859
6	9130
7	106039
8	1297295
9	16428300
10	213388961
11	2827645453
12	38086408002
13	520062618300
14	7184570776213
15	100256059855188
16	1411319038583375
17	20021022607979629
18	285965560309310708
19	4109498933510809561
20	59380204746202961953
21	862266486434574492404

[1, 3, 14, 95, 859, 9130, 106039, 1297295, 16428300, 213388961, 2827645453, 38086408002, 520062618300, 7184570776213, 100256059855188, 1411319038583375, 20021022607979629, 285965560309310708, 4109498933510809561, 59380204746202961953, 862266486434574492404]

cp's OEIS Frontend

A113181 Number of unrooted two-vertex (or, dually, two-face) regular planar maps of even valency 2n considered up to orientation-preserving homeomorphism.

Table of values

List of values