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A123788
as a simple table
n
a(n)
1
1
2
5
3
53
4
623
5
8075
6
108463
7
1499542
8
21128897
9
302219695
10
4373563505
[1,5,53,623,8075,108463,1499542,21128897, 302219695,4373563505]