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A318567
as a simple table
n
a(n)
1
1
2
3
3
8
4
21
5
54
6
137
7
343
8
847
9
2075
10
5031
11
12109
12
28921
13
68633
14
161865
15
379655
[1,3,8,21,54,137,343,847,2075,5031,12109,28921, 68633,161865,379655]