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A077622
as a simple table
n
a(n)
1
1
2
2
3
7
4
27
5
190
6
1621
7
17271
8
200536
9
2757881
10
47108763
11
843069901
12
17797435824
[1,2,7,27,190,1621,17271,200536,2757881,47108763, 843069901,17797435824]