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A245011
as a simple table
n
a(n)
1
1
2
4
3
6
4
86
5
854
6
9556
7
146168
8
2660326
9
56083228
10
1349544632
11
36786865968
12
1117327217782
[1,4,6,86,854,9556,146168,2660326,56083228, 1349544632,36786865968,1117327217782]