A087903 - cp's OEIS frontend

A087903 Triangle read by rows of the numbers T(n,k) (n > 1, 0 < k < n) of set partitions of n of length k which do not have a proper subset of parts with a union equal to a subset {1,2,...,j} with j < n.

n	a(n)
2	1
3	1
4	1
5	1
6	4
7	1
8	1
9	11
10	9
11	1
12	1
13	26
14	48
15	16
16	1
17	1
18	57
19	202
20	140
21	25
22	1
23	1
24	120
25	747
26	916
27	325
28	36
29	1
30	1
31	247
32	2559
33	5071
34	3045
35	651
36	49
37	1
38	1
39	502
40	8362
41	25300
42	23480
43	8260
44	1176
45	64
46	1
47	1
48	1013
49	26520
50	117962
51	159736
52	84456
53	19404
54	1968
55	81
56	1
57	1
58	2036
59	82509
60	525608
61	998830
62	749154
63	253764
64	40944
65	3105
66	100
67	1

[1, 1, 1, 1, 4, 1, 1, 11, 9, 1, 1, 26, 48, 16, 1, 1, 57, 202, 140, 25, 1, 1, 120, 747, 916, 325, 36, 1, 1, 247, 2559, 5071, 3045, 651, 49, 1, 1, 502, 8362, 25300, 23480, 8260, 1176, 64, 1, 1, 1013, 26520, 117962, 159736, 84456, 19404, 1968, 81, 1, 1, 2036, 82509, 525608, 998830, 749154, 253764, 40944, 3105, 100, 1]

cp's OEIS Frontend

A087903 Triangle read by rows of the numbers T(n,k) (n > 1, 0 < k < n) of set partitions of n of length k which do not have a proper subset of parts with a union equal to a subset {1,2,...,j} with j < n.

Table of values

List of values