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A180976
as a simple table
n
a(n)
1
1
2
1
3
5
4
50
5
1823
6
189359
7
61746973
8
57086318681
9
174484293356777
10
1558231919489703557
[1,1,5,50,1823,189359,61746973,57086318681, 174484293356777,1558231919489703557]