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A147436
as a simple table
n
a(n)
1
1
2
1
3
1
4
9
5
25
6
89
7
611
8
6905
9
105540
10
1741627
11
42117698
12
1578103851
13
82708302532
14
5707546949411
[1,1,1,9,25,89,611,6905,105540,1741627,42117698, 1578103851,82708302532,5707546949411]