A228550 - cp's OEIS frontend

A228550 Triangular array read by rows: T(n,k) is the number of simple labeled graphs with n vertices and k components such that each vertex has even degree; n >= 1, 1 <= k <= n.

n	a(n)
1	1
2	0
3	1
4	1
5	0
6	1
7	3
8	4
9	0
10	1
11	38
12	15
13	10
14	0
15	1
16	720
17	238
18	45
19	20
20	0
21	1
22	26614
23	5145
24	868
25	105
26	35
27	0
28	1
29	1858122
30	215355
31	21000
32	2408
33	210
34	56
35	0
36	1
37	250586792
38	16797942
39	980371
40	64260
41	5628
42	378
43	84
44	0
45	1
46	66121926720
47	2509697144
48	84370230
49	3306415
50	163800
51	11676
52	630
53	120
54	0
55	1

[1, 0, 1, 1, 0, 1, 3, 4, 0, 1, 38, 15, 10, 0, 1, 720, 238, 45, 20, 0, 1, 26614, 5145, 868, 105, 35, 0, 1, 1858122, 215355, 21000, 2408, 210, 56, 0, 1, 250586792, 16797942, 980371, 64260, 5628, 378, 84, 0, 1, 66121926720, 2509697144, 84370230, 3306415, 163800, 11676, 630, 120, 0, 1]

cp's OEIS Frontend

A228550 Triangular array read by rows: T(n,k) is the number of simple labeled graphs with n vertices and k components such that each vertex has even degree; n >= 1, 1 <= k <= n.

Table of values

List of values