A199840 - cp's OEIS frontend

A199840 Triangle read by rows: T(n,k) is the number of 2-multigraphs on n nodes having exactly k edges, with n >= 1 and 0 <= k <= n*(n-1).

n	a(n)
1	1
2	1
3	1
4	1
5	1
6	1
7	2
8	2
9	2
10	1
11	1
12	1
13	1
14	3
15	5
16	8
17	9
18	12
19	9
20	8
21	5
22	3
23	1
24	1
25	1
26	1
27	3
28	6
29	14
30	24
31	43
32	62
33	87
34	100
35	110
36	100
37	87
38	62
39	43
40	24
41	14
42	6
43	3
44	1
45	1
46	1
47	1
48	3
49	7
50	18
51	40
52	91
53	180
54	352
55	616
56	1006
57	1483
58	2036
59	2522
60	2891
61	3012
62	2891
63	2522
64	2036
65	1483
66	1006
67	616
68	352
69	180
70	91
71	40
72	18
73	7
74	3
75	1
76	1

[1, 1, 1, 1, 1, 1, 2, 2, 2, 1, 1, 1, 1, 3, 5, 8, 9, 12, 9, 8, 5, 3, 1, 1, 1, 1, 3, 6, 14, 24, 43, 62, 87, 100, 110, 100, 87, 62, 43, 24, 14, 6, 3, 1, 1, 1, 1, 3, 7, 18, 40, 91, 180, 352, 616, 1006, 1483, 2036, 2522, 2891, 3012, 2891, 2522, 2036, 1483, 1006, 616, 352, 180, 91, 40, 18, 7, 3, 1, 1]

cp's OEIS Frontend

A199840 Triangle read by rows: T(n,k) is the number of 2-multigraphs on n nodes having exactly k edges, with n >= 1 and 0 <= k <= n*(n-1).

Table of values

List of values