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A074327
as a simple table
n
a(n)
1
3
2
311
3
1619
4
3671
5
1742537
6
148948139
7
2777105129
8
16149760533341
9
10082409897709157
[3,311,1619,3671,1742537,148948139,2777105129, 16149760533341,10082409897709157]