A146848 - OEIS

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A146848 as a simple table

n	a(n)
1	1
2	1
3	1
4	1
5	1
6	1
7	17
8	21
9	589
10	1209
11	14169
12	35833
13	752335
14	2255937
15	153849079
16	571403355
17	75555523219
18	350876915239
19	81358170973501
20	466475370757593
21	166717546455270435
22	1170203411896641439

[1,1,1,1,1,1,17,21,589,1209,14169,35833,752335, 2255937,153849079,571403355,75555523219, 350876915239,81358170973501,466475370757593, 166717546455270435,1170203411896641439]