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A003201
as a simple table
n
a(n)
0
1
1
8
2
32
3
108
4
348
5
1068
6
3180
7
9216
8
26452
9
73708
10
206872
11
563200
12
1555460
13
4124568
14
11450284
[1,8,32,108,348,1068,3180,9216,26452,73708,206872, 563200,1555460,4124568,11450284]