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A147428
as a simple table
n
a(n)
1
1
2
1
3
1
4
9
5
25
6
89
7
469
8
5217
9
82459
10
1354121
11
28702995
12
915889909
13
44493843165
14
2922255231469
[1,1,1,9,25,89,469,5217,82459,1354121,28702995, 915889909,44493843165,2922255231469]