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A241586
as a simple table
n
a(n)
1
1
2
1
3
2
4
5
5
34
6
2135
7
7013320
8
1788782616656
9
53304527811667897248
10
366299663432194332594005123072
[1,1,2,5,34,2135,7013320,1788782616656, 53304527811667897248, 366299663432194332594005123072]