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A203217
as a simple table
n
a(n)
1
1
2
2
3
8
4
59
5
731
6
15277
7
617467
8
42956004
9
5260670473
10
1155997481999
[1,2,8,59,731,15277,617467,42956004,5260670473, 1155997481999]