A146588 - OEIS

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A146588 as a simple table

n	a(n)
1	1
2	1
3	1
4	1
5	1
6	1
7	1
8	1
9	17
10	17
11	49
12	49
13	301
14	301
15	4891
16	4891
17	104131
18	104131
19	3555075
20	3555075
21	179509487
22	179509487
23	14641599949

[1,1,1,1,1,1,1,1,17,17,49,49,301,301,4891,4891, 104131,104131,3555075,3555075,179509487,179509487, 14641599949]