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A084607
as a simple table
n
a(n)
0
1
1
2
2
8
3
32
4
136
5
592
6
2624
7
11776
8
53344
9
243392
10
1116928
11
5149696
12
23835904
[1,2,8,32,136,592,2624,11776,53344,243392,1116928, 5149696,23835904]