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A220842
as a simple table
n
a(n)
1
2
2
4
3
7
4
14
5
25
6
50
7
90
8
160
9
320
10
584
11
1039
12
1861
13
3722
14
6774
[2,4,7,14,25,50,90,160,320,584,1039,1861,3722, 6774]