A318390 - cp's OEIS frontend

A318390 Regular triangle where T(n,k) is the number of pairs of set partitions of {1,...,n} with join {{1,...,n}} and meet of length k.

n	a(n)
1	1
2	1
3	2
4	1
5	6
6	8
7	1
8	14
9	48
10	56
11	1
12	30
13	200
14	560
15	552
16	1
17	62
18	720
19	3640
20	8280
21	7202
22	1
23	126
24	2408
25	19600
26	77280
27	151242
28	118456
29	1
30	254
31	7728
32	95256
33	579600
34	1915732
35	3316768
36	2369922
37	1
38	510
39	24200
40	435120
41	3836952
42	19056492
43	54726672
44	85317192
45	56230544
46	1

[1, 1, 2, 1, 6, 8, 1, 14, 48, 56, 1, 30, 200, 560, 552, 1, 62, 720, 3640, 8280, 7202, 1, 126, 2408, 19600, 77280, 151242, 118456, 1, 254, 7728, 95256, 579600, 1915732, 3316768, 2369922, 1, 510, 24200, 435120, 3836952, 19056492, 54726672, 85317192, 56230544, 1]

cp's OEIS Frontend

A318390 Regular triangle where T(n,k) is the number of pairs of set partitions of {1,...,n} with join {{1,...,n}} and meet of length k.

Table of values

List of values