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A337516
as a simple table
n
a(n)
1
1
2
2
3
4
4
9
5
23
6
57
7
151
8
421
9
1202
10
3397
11
9498
12
25970
13
70005
14
187259
15
500061
[1,2,4,9,23,57,151,421,1202,3397,9498,25970,70005, 187259,500061]