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A263976
as a simple table
n
a(n)
1
0
2
13856
3
2940624
4
226810352
5
24130893568
6
4071813326144
7
609140174072448
8
78375823545772864
[0,13856,2940624,226810352,24130893568, 4071813326144,609140174072448,78375823545772864]