A022173 - OEIS

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A022173 as a simple table

n	a(n)
0	1
1	1
2	1
3	1
4	10
5	1
6	1
7	91
8	91
9	1
10	1
11	820
12	7462
13	820
14	1
15	1
16	7381
17	605242
18	605242
19	7381
20	1
21	1
22	66430
23	49031983
24	441826660
25	49031983
26	66430
27	1
28	1
29	597871
30	3971657053
31	322140667123
32	322140667123
33	3971657053

[1,1,1,1,10,1,1,91,91,1,1,820,7462,820,1,1,7381, 605242,605242,7381,1,1,66430,49031983,441826660, 49031983,66430,1,1,597871,3971657053,322140667123, 322140667123,3971657053]