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A203113
as a simple table
n
a(n)
1
1
2
5
3
20
4
208
5
3516
6
108850
7
6900201
8
776174640
9
167355580505
10
68493666999406
[1,5,20,208,3516,108850,6900201,776174640, 167355580505,68493666999406]