A146584 - OEIS

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A146584 as a simple table

n	a(n)
1	1
2	1
3	1
4	1
5	1
6	1
7	9
8	15
9	53
10	69
11	367
12	797
13	5383
14	14177
15	132187
16	419443
17	4770865
18	18981007
19	272701021
20	1381813173
21	25671154071
22	163453499965

[1,1,1,1,1,1,9,15,53,69,367,797,5383,14177,132187, 419443,4770865,18981007,272701021,1381813173, 25671154071,163453499965]