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A008984
as a simple table
n
a(n)
0
1
1
1
2
3
3
10
4
35
5
133
6
538
7
2144
8
8643
9
34690
10
139122
11
556618
[1,1,3,10,35,133,538,2144,8643,34690,139122, 556618]
