A343090 - cp's OEIS frontend

A343090 Triangle read by rows: T(n,k) is the number of rooted toroidal maps with n edges and k faces and without separating cycles or isthmuses, n >= 2, k = 1..n-1.

n	a(n)
2	1
3	4
4	4
5	10
6	47
7	10
8	20
9	240
10	240
11	20
12	35
13	831
14	2246
15	831
16	35
17	56
18	2282
19	12656
20	12656
21	2282
22	56
23	84
24	5362
25	52164
26	109075
27	52164
28	5362
29	84
30	120
31	11256
32	173776
33	648792
34	648792
35	173776
36	11256
37	120
38	165
39	21690
40	495820
41	2978245
42	5360286
43	2978245
44	495820
45	21690
46	165

[1, 4, 4, 10, 47, 10, 20, 240, 240, 20, 35, 831, 2246, 831, 35, 56, 2282, 12656, 12656, 2282, 56, 84, 5362, 52164, 109075, 52164, 5362, 84, 120, 11256, 173776, 648792, 648792, 173776, 11256, 120, 165, 21690, 495820, 2978245, 5360286, 2978245, 495820, 21690, 165]

cp's OEIS Frontend

A343090 Triangle read by rows: T(n,k) is the number of rooted toroidal maps with n edges and k faces and without separating cycles or isthmuses, n >= 2, k = 1..n-1.

Table of values

List of values