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A235018
as a simple table
n
a(n)
1
88
2
1200
3
14800
4
170568
5
1830768
6
18670696
7
180093160
8
1680608680
9
14967698864
[88,1200,14800,170568,1830768,18670696,180093160, 1680608680,14967698864]