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A146698
as a simple table
n
a(n)
1
1
2
1
3
1
4
17
5
49
6
329
7
4359
8
91969
9
2747799
10
116126725
11
8159527395
12
914171765779
13
153266923609199
[1,1,1,17,49,329,4359,91969,2747799,116126725, 8159527395,914171765779,153266923609199]