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A021000
as a simple table
n
a(n)
0
2
1
7
2
24
3
82
4
280
5
956
6
3264
7
11144
8
38048
9
129904
10
443520
11
1514272
12
5170048
[2,7,24,82,280,956,3264,11144,38048,129904,443520, 1514272,5170048]