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A308146
as a simple table
n
a(n)
2
1
3
4
4
96
5
12256
6
32132352
7
392007078912
8
229067542255136768
9
567590310776091831336960
[1,4,96,12256,32132352,392007078912, 229067542255136768,567590310776091831336960]