A318392 - cp's OEIS frontend

A318392 Regular triangle where T(n,k) is the number of pairs of set partitions of {1,...,n} with join of length k.

n	a(n)
1	1
2	3
3	1
4	15
5	9
6	1
7	119
8	87
9	18
10	1
11	1343
12	1045
13	285
14	30
15	1
16	19905
17	15663
18	4890
19	705
20	45
21	1
22	369113
23	286419
24	95613
25	16450
26	1470
27	63
28	1
29	8285261
30	6248679
31	2147922
32	410053
33	44870
34	2730
35	84
36	1
37	219627683
38	159648795
39	55211229
40	11202534
41	1394883
42	105714
43	4662
44	108
45	1

[1, 3, 1, 15, 9, 1, 119, 87, 18, 1, 1343, 1045, 285, 30, 1, 19905, 15663, 4890, 705, 45, 1, 369113, 286419, 95613, 16450, 1470, 63, 1, 8285261, 6248679, 2147922, 410053, 44870, 2730, 84, 1, 219627683, 159648795, 55211229, 11202534, 1394883, 105714, 4662, 108, 1]

cp's OEIS Frontend

A318392 Regular triangle where T(n,k) is the number of pairs of set partitions of {1,...,n} with join of length k.

Table of values

List of values