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A122234
as a simple table
n
a(n)
1
5
2
18
3
62
4
180
5
620
6
1836
7
5997
8
23675
9
76849
10
263613
11
923897
12
3090855
[5,18,62,180,620,1836,5997,23675,76849,263613, 923897,3090855]