A333711 - cp's OEIS frontend

A333711 Number of permutations of [n] such that the product of the first k elements and the product of the last k elements are multiples of k! for all k in [n].

n	a(n)
0	1
1	1
2	2
3	2
4	8
5	4
6	32
7	4
8	96
9	244
10	1400
11	20
12	3988
13	12
14	256
15	1328
16	3107082
17	7900
18	4352004
19	2676
20	752280
21	4710724
22	23591664
23	672
24	79424164
25	51627164
26	4705224
27	802988332
28	25488756038104
29	47736592
30	1706618983956
31	826828

[1, 1, 2, 2, 8, 4, 32, 4, 96, 244, 1400, 20, 3988, 12, 256, 1328, 3107082, 7900, 4352004, 2676, 752280, 4710724, 23591664, 672, 79424164, 51627164, 4705224, 802988332, 25488756038104, 47736592, 1706618983956, 826828]

cp's OEIS Frontend

A333711 Number of permutations of [n] such that the product of the first k elements and the product of the last k elements are multiples of k! for all k in [n].

Table of values

List of values