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A358878
as a simple table
n
a(n)
1
2
2
5
3
7
4
15
5
20
6
47
7
84
8
138
9
169
10
257
11
263
12
431
13
559
14
2939
15
4403
16
4870
17
5273
[2,5,7,15,20,47,84,138,169,257,263,431,559,2939, 4403,4870,5273]