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A354159
as a simple table
n
a(n)
1
2
2
13
3
103
4
239
5
499
6
1567
7
3257
8
6971
9
14447
10
30259
11
63317
12
130699
[2,13,103,239,499,1567,3257,6971,14447,30259, 63317,130699]