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A007669
as a simple table
n
a(n)
1
1
2
2
3
4
4
8
5
16
6
36
7
80
8
194
9
506
10
1449
11
4631
12
17106
13
74820
14
404283
15
2815595
[1,2,4,8,16,36,80,194,506,1449,4631,17106,74820, 404283,2815595]