A146785 - OEIS

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A146785 as a simple table

n	a(n)
1	1
2	1
3	1
4	1
5	1
6	1
7	1
8	1
9	17
10	17
11	57
12	57
13	369
14	369
15	5039
16	5039
17	105411
18	105411
19	2937697
20	2937697
21	116344821
22	116344821

[1,1,1,1,1,1,1,1,17,17,57,57,369,369,5039,5039, 105411,105411,2937697,2937697,116344821,116344821]