A260885 - cp's OEIS frontend

A260885 Triangle read by rows: T(n,g) = number of general immersions of a circle with n crossings in a surface of arbitrary genus g (the circle is oriented, the surface is unoriented).

n	a(n)
1	1
2	2
3	1
4	6
5	6
6	2
7	21
8	62
9	37
10	0
11	97
12	559
13	788
14	112
15	0
16	579
17	5614
18	14558
19	7223
20	0
21	0
22	3812
23	56526
24	246331
25	277407
26	34748
27	0
28	0
29	27328
30	580860
31	3900740
32	8179658
33	3534594
34	0
35	0
36	0
37	206410
38	6020736
39	58842028
40	203974134
41	198559566
42	22524176
43	0
44	0
45	0

[1, 2, 1, 6, 6, 2, 21, 62, 37, 0, 97, 559, 788, 112, 0, 579, 5614, 14558, 7223, 0, 0, 3812, 56526, 246331, 277407, 34748, 0, 0, 27328, 580860, 3900740, 8179658, 3534594, 0, 0, 0, 206410, 6020736, 58842028, 203974134, 198559566, 22524176, 0, 0, 0]

cp's OEIS Frontend

A260885 Triangle read by rows: T(n,g) = number of general immersions of a circle with n crossings in a surface of arbitrary genus g (the circle is oriented, the surface is unoriented).

Table of values

List of values