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A356723
as a simple table
n
a(n)
1
1
2
1
3
2
4
105
5
58464
6
1938602560
7
4023598254840240
8
823167665449254453563025
[1,1,2,105,58464,1938602560,4023598254840240, 823167665449254453563025]