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A202763
as a simple table
n
a(n)
1
1
2
7
3
39
4
398
5
7425
6
227653
7
12223523
8
1135502370
9
181653002661
10
50504518603881
[1,7,39,398,7425,227653,12223523,1135502370, 181653002661,50504518603881]