A055130 - cp's OEIS frontend

A055130 Triangle T(n,k) of numbers of k-covers of an unlabeled n-set, k=1..2^n-1.

n	a(n)
1	1
2	1
3	2
4	1
5	1
6	4
7	9
8	10
9	6
10	3
11	1
12	1
13	7
14	29
15	87
16	181
17	287
18	364
19	365
20	290
21	187
22	97
23	39
24	13
25	4
26	1
27	1
28	10
29	72
30	417
31	1973
32	7745
33	25830
34	74017
35	183420
36	395311
37	744495
38	1229807
39	1787135
40	2289925
41	2591162
42	2591163
43	2289929
44	1787148
45	1229846
46	744592
47	395498

[1, 1, 2, 1, 1, 4, 9, 10, 6, 3, 1, 1, 7, 29, 87, 181, 287, 364, 365, 290, 187, 97, 39, 13, 4, 1, 1, 10, 72, 417, 1973, 7745, 25830, 74017, 183420, 395311, 744495, 1229807, 1787135, 2289925, 2591162, 2591163, 2289929, 1787148, 1229846, 744592, 395498]

cp's OEIS Frontend

A055130 Triangle T(n,k) of numbers of k-covers of an unlabeled n-set, k=1..2^n-1.

Table of values

List of values