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A196898
as a simple table
n
a(n)
1
1
2
1
3
20
4
401
5
37194
6
9855864
7
8351540397
8
21716826606543
9
177451785967252194
[1,1,20,401,37194,9855864,8351540397, 21716826606543,177451785967252194]