A318389 - cp's OEIS frontend

A318389 Regular triangle where T(n,k) is the number of pairs of set partitions of {1,...,n} with meet {{1},...,{n}} and join of length k.

n	a(n)
1	1
2	2
3	1
4	8
5	6
6	1
7	56
8	44
9	12
10	1
11	552
12	440
13	140
14	20
15	1
16	7202
17	5632
18	1920
19	340
20	30
21	1
22	118456
23	89278
24	31192
25	6160
26	700
27	42
28	1
29	2369922
30	1708016
31	595448
32	124432
33	16240
34	1288
35	56
36	1
37	56230544
38	38592786
39	13214672
40	2830632
41	400512
42	37296
43	2184
44	72
45	1
46	1552048082

[1, 2, 1, 8, 6, 1, 56, 44, 12, 1, 552, 440, 140, 20, 1, 7202, 5632, 1920, 340, 30, 1, 118456, 89278, 31192, 6160, 700, 42, 1, 2369922, 1708016, 595448, 124432, 16240, 1288, 56, 1, 56230544, 38592786, 13214672, 2830632, 400512, 37296, 2184, 72, 1, 1552048082]

cp's OEIS Frontend

A318389 Regular triangle where T(n,k) is the number of pairs of set partitions of {1,...,n} with meet {{1},...,{n}} and join of length k.

Table of values

List of values