A217285 - cp's OEIS frontend

A217285 Irregular triangle read by rows: T(n,k) is the number of labeled relations on n nodes with exactly k edges; n>=0, 0<=k<=n^2.

n	a(n)
0	1
1	1
2	1
3	1
4	4
5	6
6	4
7	1
8	1
9	9
10	36
11	84
12	126
13	126
14	84
15	36
16	9
17	1
18	1
19	16
20	120
21	560
22	1820
23	4368
24	8008
25	11440
26	12870
27	11440
28	8008
29	4368
30	1820
31	560
32	120
33	16
34	1
35	1
36	25
37	300
38	2300
39	12650
40	53130
41	177100
42	480700
43	1081575
44	2042975
45	3268760
46	4457400
47	5200300
48	5200300
49	4457400
50	3268760
51	2042975
52	1081575
53	480700
54	177100
55	53130
56	12650
57	2300
58	300
59	25
60	1

[1, 1, 1, 1, 4, 6, 4, 1, 1, 9, 36, 84, 126, 126, 84, 36, 9, 1, 1, 16, 120, 560, 1820, 4368, 8008, 11440, 12870, 11440, 8008, 4368, 1820, 560, 120, 16, 1, 1, 25, 300, 2300, 12650, 53130, 177100, 480700, 1081575, 2042975, 3268760, 4457400, 5200300, 5200300, 4457400, 3268760, 2042975, 1081575, 480700, 177100, 53130, 12650, 2300, 300, 25, 1]

cp's OEIS Frontend

A217285 Irregular triangle read by rows: T(n,k) is the number of labeled relations on n nodes with exactly k edges; n>=0, 0<=k<=n^2.

Table of values

List of values