A147195 - OEIS

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A147195 as a simple table

n	a(n)
1	1
2	1
3	1
4	1
5	1
6	1
7	1
8	1
9	5
10	5
11	17
12	17
13	45
14	45
15	217
16	217
17	1805
18	1805
19	29665
20	29665
21	431133
22	431133
23	7762019
24	7762019
25	212346129
26	212346129

[1,1,1,1,1,1,1,1,5,5,17,17,45,45,217,217,1805, 1805,29665,29665,431133,431133,7762019,7762019, 212346129,212346129]