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A005646
as a simple table
n
a(n)
1
1
2
1
3
1
4
3
5
6
6
26
7
122
8
1015
9
11847
10
208914
11
5236991
12
184321511
[1,1,1,3,6,26,122,1015,11847,208914,5236991, 184321511]