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A268144
as a simple table
n
a(n)
1
0
2
6
3
6
4
672
5
4734
6
177048
7
4131792
8
132137160
9
4330697670
10
144754955796
[0,6,6,672,4734,177048,4131792,132137160, 4330697670,144754955796]