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A071540
as a simple table
n
a(n)
1
4
2
57
3
664
4
7068
5
73130
6
747244
7
7590269
8
76830140
9
775940042
10
7824134360
[4,57,664,7068,73130,747244,7590269,76830140, 775940042,7824134360]