A124503 - cp's OEIS frontend

A124503 Triangle read by rows: T(n,k) is the number of set partitions of the set {1,2,...,n} (or of any n-set) containing k blocks of size 3 (0<=k<=floor(n/3)).

n	a(n)
0	1
1	1
2	2
3	4
4	1
5	11
6	4
7	32
8	20
9	113
10	80
11	10
12	422
13	385
14	70
15	1788
16	1792
17	560
18	8015
19	9492
20	3360
21	280
22	39435
23	50640
24	23100
25	2800
26	204910
27	295020
28	147840
29	30800
30	1144377
31	1763300
32	1044120
33	246400
34	15400
35	6722107
36	11278410
37	7241520
38	2202200
39	200200
40	41877722

[1, 1, 2, 4, 1, 11, 4, 32, 20, 113, 80, 10, 422, 385, 70, 1788, 1792, 560, 8015, 9492, 3360, 280, 39435, 50640, 23100, 2800, 204910, 295020, 147840, 30800, 1144377, 1763300, 1044120, 246400, 15400, 6722107, 11278410, 7241520, 2202200, 200200, 41877722]

cp's OEIS Frontend

A124503 Triangle read by rows: T(n,k) is the number of set partitions of the set {1,2,...,n} (or of any n-set) containing k blocks of size 3 (0<=k<=floor(n/3)).

Table of values

List of values