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A226058
as a simple table
n
a(n)
1
1
2
2
3
12
4
163
5
57800
6
6910401969
7
69047272940549306735
8
9431570193753590001558014495854550084583
[1,2,12,163,57800,6910401969,69047272940549306735, 9431570193753590001558014495854550084583]