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A003210
as a simple table
n
a(n)
0
1
1
8
2
56
3
248
4
1232
5
5690
6
26636
7
113552
8
532736
9
2207108
10
10385062
[1,8,56,248,1232,5690,26636,113552,532736,2207108, 10385062]