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A011791
as a simple table
n
a(n)
0
1
1
2
2
8
3
35
4
169
5
862
6
4575
7
24999
8
139700
9
794684
10
4586377
11
26788423
12
158054285
13
940603900
[1,2,8,35,169,862,4575,24999,139700,794684, 4586377,26788423,158054285,940603900]