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A146412
as a simple table
n
a(n)
1
1
2
1
3
1
4
1
5
5
6
25
7
59
8
371
9
1829
10
12351
11
114789
12
1410427
13
19272237
14
385707683
15
8418983493
16
256858401273
[1,1,1,1,5,25,59,371,1829,12351,114789,1410427, 19272237,385707683,8418983493,256858401273]