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A230818
as a simple table
n
a(n)
1
0
2
18
3
2114
4
108006
5
10872238
6
888633610
7
75341251814
8
6484756891722
9
546028214903014
[0,18,2114,108006,10872238,888633610,75341251814, 6484756891722,546028214903014]