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A290187
as a simple table
n
a(n)
1
5
2
23
3
68
4
168
5
377
6
801
7
1657
8
3377
9
6825
10
13729
11
27545
12
55185
[5,23,68,168,377,801,1657,3377,6825,13729,27545, 55185]