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A123406
as a simple table
n
a(n)
1
1
2
2
3
4
4
11
5
33
6
144
7
826
8
6836
9
76322
10
1126575
11
21410245
12
521199672
[1,2,4,11,33,144,826,6836,76322,1126575,21410245, 521199672]