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A057864
as a simple table
n
a(n)
1
1
2
1
3
2
4
5
5
18
6
91
7
734
8
10030
9
248427
10
11482572
11
1000231510
[1,1,2,5,18,91,734,10030,248427,11482572, 1000231510]