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A264543
as a simple table
n
a(n)
1
0
2
2
3
16
4
216
5
14852
6
1994830
7
591482528
8
510948245264
9
1135318355003028
10
6257173857277450930
[0,2,16,216,14852,1994830,591482528,510948245264, 1135318355003028,6257173857277450930]