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A351730
as a simple table
n
a(n)
0
1
1
1
2
4
3
35
4
604
5
16727
6
681232
7
38187291
8
2810370122
9
261999605819
[1,1,4,35,604,16727,681232,38187291,2810370122, 261999605819]