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A156470
as a simple table
n
a(n)
3
4
4
68
5
1844
6
313880
7
91441740
8
58741831848
9
78227960348272
10
210460779796568160
[4,68,1844,313880,91441740,58741831848, 78227960348272,210460779796568160]