A185644 - cp's OEIS frontend

A185644 Triangular array E(n,k) counting, not necessarily connected, k-regular simple graphs on n vertices with girth exactly 4.

n	a(n)
1	0
2	0
3	0
4	0
5	0
6	0
7	0
8	1
9	0
10	0
11	0
12	0
13	0
14	0
15	1
16	0
17	0
18	0
19	0
20	0
21	0
22	1
23	2
24	1
25	0
26	0
27	1
28	0
29	0
30	0
31	0
32	0
33	5
34	2
35	1
36	0
37	0
38	1
39	0
40	2
41	0
42	0
43	0
44	2
45	21
46	12
47	1
48	1
49	0
50	0
51	2
52	0
53	31
54	0
55	0
56	0
57	0
58	3
59	103
60	220
61	7
62	1
63	1
64	0
65	0
66	3
67	0
68	1606
69	0
70	1
71	0
72	0
73	0
74	5
75	752
76	16829
77	388
78	9
79	1
80	1
81	0
82	0
83	5
84	0
85	193900
86	0
87	6
88	0
89	0
90	0

[0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 1, 2, 1, 0, 0, 1, 0, 0, 0, 0, 0, 5, 2, 1, 0, 0, 1, 0, 2, 0, 0, 0, 2, 21, 12, 1, 1, 0, 0, 2, 0, 31, 0, 0, 0, 0, 3, 103, 220, 7, 1, 1, 0, 0, 3, 0, 1606, 0, 1, 0, 0, 0, 5, 752, 16829, 388, 9, 1, 1, 0, 0, 5, 0, 193900, 0, 6, 0, 0, 0]

cp's OEIS Frontend

A185644 Triangular array E(n,k) counting, not necessarily connected, k-regular simple graphs on n vertices with girth exactly 4.

Table of values

List of values