A175757 - cp's OEIS frontend

A175757 Triangular array read by rows: T(n,k) is the number of blocks of size k in all set partitions of {1,2,...,n}.

n	a(n)
1	1
2	2
3	1
4	6
5	3
6	1
7	20
8	12
9	4
10	1
11	75
12	50
13	20
14	5
15	1
16	312
17	225
18	100
19	30
20	6
21	1
22	1421
23	1092
24	525
25	175
26	42
27	7
28	1
29	7016
30	5684
31	2912
32	1050
33	280
34	56
35	8
36	1
37	37260
38	31572
39	17052
40	6552
41	1890
42	420
43	72
44	9
45	1
46	211470
47	186300
48	105240
49	42630
50	13104
51	3150
52	600
53	90
54	10
55	1

[1, 2, 1, 6, 3, 1, 20, 12, 4, 1, 75, 50, 20, 5, 1, 312, 225, 100, 30, 6, 1, 1421, 1092, 525, 175, 42, 7, 1, 7016, 5684, 2912, 1050, 280, 56, 8, 1, 37260, 31572, 17052, 6552, 1890, 420, 72, 9, 1, 211470, 186300, 105240, 42630, 13104, 3150, 600, 90, 10, 1]

cp's OEIS Frontend

A175757 Triangular array read by rows: T(n,k) is the number of blocks of size k in all set partitions of {1,2,...,n}.

Table of values

List of values