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A307934
as a simple table
n
a(n)
1
0
2
1
3
4
4
96
5
25376
6
32132352
7
1295557991168
8
229067542255136768
9
2627612220112334649458688
[0,1,4,96,25376,32132352,1295557991168, 229067542255136768,2627612220112334649458688]