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A124005
as a simple table
n
a(n)
0
1
1
4
2
12
3
54
4
236
5
1288
6
7092
7
42614
8
269352
9
1743560
10
11922442
11
80209268
12
562280115
13
3772081046
[1,4,12,54,236,1288,7092,42614,269352,1743560, 11922442,80209268,562280115,3772081046]