A146903 - OEIS

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A146903 as a simple table

n	a(n)
1	1
2	1
3	1
4	1
5	1
6	1
7	1
8	1
9	3
10	3
11	9
12	9
13	19
14	19
15	49
16	49
17	345
18	345
19	3029
20	3029
21	26343
22	26343
23	253497
24	253497
25	4034589
26	4034589
27	91237121
28	91237121
29	2505865849
30	2505865849

[1,1,1,1,1,1,1,1,3,3,9,9,19,19,49,49,345,345,3029, 3029,26343,26343,253497,253497,4034589,4034589, 91237121,91237121,2505865849,2505865849]