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A057528
as a simple table
n
a(n)
0
1
1
1
2
2
3
96
4
31850496
5
2524286414780230533120
6
1189172215782988266980141580906985588465965465600000
[1,1,2,96,31850496,2524286414780230533120, 11891722157829882669801415809069855884659654656000\ 00]