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A183282
as a simple table
n
a(n)
1
2
2
8
3
54
4
646
5
14222
6
555120
7
38707416
8
4852741246
9
1088604700024
10
437267393817902
11
314722463901327496
[2,8,54,646,14222,555120,38707416,4852741246, 1088604700024,437267393817902,314722463901327496]