A371830 - cp's OEIS frontend

A371830 Irregular triangle read by rows: T(n,k) is the number of unlabeled n-vertex hypergraphs (or set systems) with k hyperedges (none of which is empty), 0 <= k <= 2^n-1.

n	a(n)
0	1
1	1
2	1
3	1
4	2
5	2
6	1
7	1
8	3
9	6
10	10
11	10
12	6
13	3
14	1
15	1
16	4
17	13
18	39
19	97
20	187
21	290
22	365
23	365
24	290
25	187
26	97
27	39
28	13
29	4
30	1
31	1
32	5
33	23
34	111
35	514
36	2160
37	8035
38	26195
39	74382
40	183710
41	395498
42	744592
43	1229846
44	1787148
45	2289929
46	2591163
47	2591163
48	2289929
49	1787148
50	1229846
51	744592
52	395498
53	183710
54	74382
55	26195
56	8035
57	2160
58	514
59	111
60	23
61	5
62	1

[1, 1, 1, 1, 2, 2, 1, 1, 3, 6, 10, 10, 6, 3, 1, 1, 4, 13, 39, 97, 187, 290, 365, 365, 290, 187, 97, 39, 13, 4, 1, 1, 5, 23, 111, 514, 2160, 8035, 26195, 74382, 183710, 395498, 744592, 1229846, 1787148, 2289929, 2591163, 2591163, 2289929, 1787148, 1229846, 744592, 395498, 183710, 74382, 26195, 8035, 2160, 514, 111, 23, 5, 1]

cp's OEIS Frontend

A371830 Irregular triangle read by rows: T(n,k) is the number of unlabeled n-vertex hypergraphs (or set systems) with k hyperedges (none of which is empty), 0 <= k <= 2^n-1.

Table of values

List of values