A049020 - cp's OEIS frontend

A049020 Triangle of numbers a(n,k), 0 <= k <= n: number of set partitions of {1,2,...,n} in which exactly k of the blocks have been distinguished.

n	a(n)
0	1
1	1
2	1
3	2
4	3
5	1
6	5
7	10
8	6
9	1
10	15
11	37
12	31
13	10
14	1
15	52
16	151
17	160
18	75
19	15
20	1
21	203
22	674
23	856
24	520
25	155
26	21
27	1
28	877
29	3263
30	4802
31	3556
32	1400
33	287
34	28
35	1
36	4140
37	17007
38	28337
39	24626
40	11991
41	3290
42	490
43	36
44	1
45	21147
46	94828
47	175896
48	174805
49	101031
50	34671
51	6972
52	786
53	45
54	1

[1, 1, 1, 2, 3, 1, 5, 10, 6, 1, 15, 37, 31, 10, 1, 52, 151, 160, 75, 15, 1, 203, 674, 856, 520, 155, 21, 1, 877, 3263, 4802, 3556, 1400, 287, 28, 1, 4140, 17007, 28337, 24626, 11991, 3290, 490, 36, 1, 21147, 94828, 175896, 174805, 101031, 34671, 6972, 786, 45, 1]

cp's OEIS Frontend

A049020 Triangle of numbers a(n,k), 0 <= k <= n: number of set partitions of {1,2,...,n} in which exactly k of the blocks have been distinguished.

Table of values

List of values