A280880 - cp's OEIS frontend

A280880 Number T(n,k) of set partitions of [n] into exactly k blocks where sizes of distinct blocks are coprime; triangle T(n,k), n>=0, 0<=k<=n, read by rows.

n	a(n)
0	1
1	0
2	1
3	0
4	1
5	1
6	0
7	1
8	3
9	1
10	0
11	1
12	4
13	6
14	1
15	0
16	1
17	15
18	10
19	10
20	1
21	0
22	1
23	6
24	75
25	20
26	15
27	1
28	0
29	1
30	63
31	21
32	245
33	35
34	21
35	1
36	0
37	1
38	64
39	476
40	56
41	630
42	56
43	28
44	1
45	0
46	1
47	171
48	540
49	2100
50	126
51	1386
52	84
53	36
54	1
55	0
56	1
57	130
58	4185
59	2640
60	6930
61	252
62	2730
63	120
64	45
65	1

[1, 0, 1, 0, 1, 1, 0, 1, 3, 1, 0, 1, 4, 6, 1, 0, 1, 15, 10, 10, 1, 0, 1, 6, 75, 20, 15, 1, 0, 1, 63, 21, 245, 35, 21, 1, 0, 1, 64, 476, 56, 630, 56, 28, 1, 0, 1, 171, 540, 2100, 126, 1386, 84, 36, 1, 0, 1, 130, 4185, 2640, 6930, 252, 2730, 120, 45, 1]

cp's OEIS Frontend

A280880 Number T(n,k) of set partitions of [n] into exactly k blocks where sizes of distinct blocks are coprime; triangle T(n,k), n>=0, 0<=k<=n, read by rows.

Table of values

List of values