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A357857
as a simple table
n
a(n)
1
1
2
4
3
21
4
232
5
14425
6
3653196
7
17705858989
8
261353065517776
9
241809117107232026097
[1,4,21,232,14425,3653196,17705858989, 261353065517776,241809117107232026097]