A146600 - OEIS

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A146600 as a simple table

n	a(n)
1	1
2	1
3	1
4	1
5	1
6	1
7	5
8	19
9	39
10	83
11	233
12	711
13	2313
14	8511
15	40097
16	191977
17	1081845
18	6288993
19	41547129
20	292524045
21	2387601825
22	20697818111

[1,1,1,1,1,1,5,19,39,83,233,711,2313,8511,40097, 191977,1081845,6288993,41547129,292524045, 2387601825,20697818111]