A146262 - OEIS

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A146262 as a simple table

n	a(n)
1	1
2	1
3	1
4	1
5	1
6	1
7	9
8	33
9	57
10	93
11	311
12	1101
13	3499
14	17317
15	84175
16	569419
17	2944127
18	17772493
19	117896615
20	988499111
21	8301329001
22	91569781875

[1,1,1,1,1,1,9,33,57,93,311,1101,3499,17317,84175, 569419,2944127,17772493,117896615,988499111, 8301329001,91569781875]