A146592 - OEIS

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A146592 as a simple table

n	a(n)
1	1
2	1
3	1
4	1
5	1
6	1
7	3
8	23
9	47
10	75
11	181
12	675
13	3025
14	16403
15	71953
16	340893
17	1986607
18	14754733
19	121306057
20	1066980245
21	9641071515
22	101852566849
23	1271193446821

[1,1,1,1,1,1,3,23,47,75,181,675,3025,16403,71953, 340893,1986607,14754733,121306057,1066980245, 9641071515,101852566849,1271193446821]