A247231 - cp's OEIS frontend

A247231 Triangular array read by rows: T(n,k) is the number of ways to partition an n-set into exactly k blocks and then partially order the blocks, n>=1, 1<=k<=n.

n	a(n)
1	1
2	1
3	3
4	1
5	9
6	19
7	1
8	21
9	114
10	219
11	1
12	45
13	475
14	2190
15	4231
16	1
17	93
18	1710
19	14235
20	63465
21	130023
22	1
23	189
24	5719
25	76650
26	592340
27	2730483
28	6129859
29	1
30	381
31	18354
32	372519
33	4442550
34	34586118
35	171636052
36	431723379
37	1
38	765
39	57475
40	1701630
41	29409681
42	344040858
43	2831994858
44	15542041644
45	44511042511

[1, 1, 3, 1, 9, 19, 1, 21, 114, 219, 1, 45, 475, 2190, 4231, 1, 93, 1710, 14235, 63465, 130023, 1, 189, 5719, 76650, 592340, 2730483, 6129859, 1, 381, 18354, 372519, 4442550, 34586118, 171636052, 431723379, 1, 765, 57475, 1701630, 29409681, 344040858, 2831994858, 15542041644, 44511042511]

cp's OEIS Frontend

A247231 Triangular array read by rows: T(n,k) is the number of ways to partition an n-set into exactly k blocks and then partially order the blocks, n>=1, 1<=k<=n.

Table of values

List of values