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A005470
as a simple table
n
a(n)
0
1
1
1
2
2
3
4
4
11
5
33
6
142
7
822
8
6966
9
79853
10
1140916
11
18681008
12
333312451
[1,1,2,4,11,33,142,822,6966,79853,1140916, 18681008,333312451]