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A325409
as a simple table
n
a(n)
1
1
2
2
3
20
4
269
5
8116
6
519400
7
67566361
8
17518353991
9
9334778743018
10
10240638005472594
11
23244895727823155064
[1,2,20,269,8116,519400,67566361,17518353991, 9334778743018,10240638005472594, 23244895727823155064]