A139526 - OEIS

A139526 as a simple table

n	a(n)
2	1
3	1
4	2
5	1
6	6
7	9
8	1
9	12
10	48
11	64
12	1
13	20
14	150
15	500
16	625
17	1
18	30
19	360
20	2160
21	6480
22	7776
23	1
24	42
25	735
26	6860
27	36015
28	100842
29	117649
30	1
31	56
32	1344
33	17920
34	143360
35	688128
36	1835008
37	2097152
38	1
39	72
40	2268
41	40824
42	459270
43	3306744
44	14880348
45	38263752
46	43046721
47	1
48	90
49	3600
50	84000
51	1260000
52	12600000
53	84000000
54	360000000
55	900000000
56	1000000000

[1,1,2,1,6,9,1,12,48,64,1,20,150,500,625,1,30,360, 2160,6480,7776,1,42,735,6860,36015,100842,117649, 1,56,1344,17920,143360,688128,1835008,2097152,1, 72,2268,40824,459270,3306744,14880348,38263752, 43046721,1,90,3600,84000,1260000,12600000, 84000000,360000000,900000000,1000000000]