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A066634
as a simple table
n
a(n)
5
5
6
16
7
42
8
138
9
357
10
1233
11
3278
12
12589
13
35789
14
159613
15
499900
16
2677865
17
9421400
18
62226044
[5,16,42,138,357,1233,3278,12589,35789,159613, 499900,2677865,9421400,62226044]