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A092922
as a simple table
n
a(n)
1
2
2
5
3
127
4
648391
5
2428095424619
6
75063692618249
7
2586559730396077
8
98552043847093519
[2,5,127,648391,2428095424619,75063692618249, 2586559730396077,98552043847093519]