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A324919
as a simple table
n
a(n)
1
2
2
2
3
12
4
28
5
80
6
180
7
476
8
1120
9
2772
10
6640
11
16236
12
38976
[2,2,12,28,80,180,476,1120,2772,6640,16236,38976]
