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A076322
as a simple table
n
a(n)
1
1
2
1
3
2
4
5
5
17
6
81
7
519
8
5218
9
81677
10
2014360
11
76140741
12
4303246908
[1,1,2,5,17,81,519,5218,81677,2014360,76140741, 4303246908]