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A301324
as a simple table
n
a(n)
1
1
2
3
3
7
4
45
5
664
6
17491
7
1127238
8
135428462
9
34057380439
10
17040140705965
[1,3,7,45,664,17491,1127238,135428462,34057380439, 17040140705965]