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A156805
as a simple table
n
a(n)
1
1
2
2
3
4
4
8
5
17
6
41
7
112
8
369
9
1555
10
8625
11
65323
12
680275
[1,2,4,8,17,41,112,369,1555,8625,65323,680275]
