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A177590
as a simple table
n
a(n)
1
1
2
6
3
90
4
2496
5
110760
6
7183476
7
640668497
8
75212295268
9
11244165636152
10
2085704995841392
[1,6,90,2496,110760,7183476,640668497,75212295268, 11244165636152,2085704995841392]