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A066756
as a simple table
n
a(n)
0
1
1
2
2
6
3
65
4
673
5
342
6
2919
7
129991
8
1590511
9
301695657
10
1412987847
[1,2,6,65,673,342,2919,129991,1590511,301695657, 1412987847]