A046649 - cp's OEIS frontend

A046649 a(n) is the number of nonseparable planar maps with 2*n+1 edges and a fixed outer face of 4 edges which are invariant under a rotation of a 1/2 turn. (Column 2 of A091665.)

n	a(n)
2	2
3	8
4	34
5	160
6	806
7	4256
8	23256
9	130416
10	746350
11	4341480
12	25594530
13	152585472
14	918324904
15	5572034240
16	34048494608
17	209347674768
18	1294227005694
19	8040125464280
20	50165404177350
21	314229490307040
22	1975283452131990
23	12456968750889600
24	78790615438385760
25	499700263517332800

[2, 8, 34, 160, 806, 4256, 23256, 130416, 746350, 4341480, 25594530, 152585472, 918324904, 5572034240, 34048494608, 209347674768, 1294227005694, 8040125464280, 50165404177350, 314229490307040, 1975283452131990, 12456968750889600, 78790615438385760, 499700263517332800]

cp's OEIS Frontend

A046649 a(n) is the number of nonseparable planar maps with 2*n+1 edges and a fixed outer face of 4 edges which are invariant under a rotation of a 1/2 turn. (Column 2 of A091665.)

Table of values

List of values