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A209005
as a simple table
n
a(n)
1
1
2
2
3
7
4
26
5
137
6
923
7
6261
8
43228
9
293991
10
1993292
11
13620471
12
94043892
13
656241875
[1,2,7,26,137,923,6261,43228,293991,1993292, 13620471,94043892,656241875]