A146694 - OEIS

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A146694 as a simple table

n	a(n)
1	1
2	1
3	1
4	1
5	1
6	1
7	1
8	3
9	9
10	19
11	37
12	103
13	317
14	831
15	2581
16	12105
17	62053
18	307133
19	1586103
20	9856867
21	66841097
22	477861431

[1,1,1,1,1,1,1,3,9,19,37,103,317,831,2581,12105, 62053,307133,1586103,9856867,66841097,477861431]