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A045529
as a simple table
n
a(n)
0
1
1
2
2
34
3
196418
4
37889062373143906
5
271964099255182923543922814194423915162591622175362
[1,2,34,196418,37889062373143906, 27196409925518292354392281419442391516259162217536\ 2]