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A318171
as a simple table
n
a(n)
1
2
2
269
3
269
4
3823
5
8539
6
729551
7
1416329
8
23592593
9
1478674861
10
20458458289
11
7558026467353
12
201008815538749
[2,269,269,3823,8539,729551,1416329,23592593, 1478674861,20458458289,7558026467353, 201008815538749]