A039810 - cp's OEIS frontend

A039810 Matrix square of Stirling2 triangle A008277: 2-levels set partitions of [n] into k first-level subsets.

n	a(n)
1	1
2	2
3	1
4	5
5	6
6	1
7	15
8	32
9	12
10	1
11	52
12	175
13	110
14	20
15	1
16	203
17	1012
18	945
19	280
20	30
21	1
22	877
23	6230
24	8092
25	3465
26	595
27	42
28	1
29	4140
30	40819
31	70756
32	40992
33	10010
34	1120
35	56
36	1
37	21147
38	283944
39	638423
40	479976
41	156072
42	24570
43	1932
44	72
45	1
46	115975
47	2090424
48	5971350
49	5660615
50	2350950
51	487704
52	53550
53	3120
54	90
55	1

[1, 2, 1, 5, 6, 1, 15, 32, 12, 1, 52, 175, 110, 20, 1, 203, 1012, 945, 280, 30, 1, 877, 6230, 8092, 3465, 595, 42, 1, 4140, 40819, 70756, 40992, 10010, 1120, 56, 1, 21147, 283944, 638423, 479976, 156072, 24570, 1932, 72, 1, 115975, 2090424, 5971350, 5660615, 2350950, 487704, 53550, 3120, 90, 1]

cp's OEIS Frontend

A039810 Matrix square of Stirling2 triangle A008277: 2-levels set partitions of [n] into k first-level subsets.

Table of values

List of values