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A060291
as a simple table
n
a(n)
1
7
2
8
3
21
4
60
5
278
6
1520
7
9583
8
61835
9
419705
10
3023007
11
22597508
[7,8,21,60,278,1520,9583,61835,419705,3023007, 22597508]