A066991 - cp's OEIS frontend

A066991 Square array read by descending antidiagonals of number of ways of dividing n*k labeled items into k unlabeled orders with n items in each order.

n	a(n)
1	1
2	1
3	2
4	1
5	12
6	6
7	1
8	120
9	360
10	24
11	1
12	1680
13	60480
14	20160
15	120
16	1
17	30240
18	19958400
19	79833600
20	1814400
21	720
22	1
23	665280
24	10897286400
25	871782912000
26	217945728000
27	239500800
28	5040
29	1
30	17297280
31	8892185702400
32	20274183401472000

[1, 1, 2, 1, 12, 6, 1, 120, 360, 24, 1, 1680, 60480, 20160, 120, 1, 30240, 19958400, 79833600, 1814400, 720, 1, 665280, 10897286400, 871782912000, 217945728000, 239500800, 5040, 1, 17297280, 8892185702400, 20274183401472000]

cp's OEIS Frontend

A066991 Square array read by descending antidiagonals of number of ways of dividing n*k labeled items into k unlabeled orders with n items in each order.

Table of values

List of values