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A188688 as a simple table

n a(n)
1 2
2 16
3 218
4 4008
5 139307
6 15547072
7 3647921173
8 1302269111985
9 832889881464413
10 1248703703842553735
11 4253189666054817624993

[2,16,218,4008,139307,15547072,3647921173,
 1302269111985,832889881464413,1248703703842553735,
 4253189666054817624993]

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Last modified May 18 23:31 EDT 2022. Contains 353826 sequences. (Running on oeis4.)