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A242533
as a simple table
n
a(n)
1
1
2
1
3
2
4
36
5
288
6
3888
7
200448
8
4257792
9
139511808
10
11813990400
11
532754620416
[1,1,2,36,288,3888,200448,4257792,139511808, 11813990400,532754620416]