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A006674
as a simple table
n
a(n)
5
1
6
1
7
2
8
6
9
18
10
68
11
282
12
1309
13
6437
14
33264
15
177260
16
968349
[1,1,2,6,18,68,282,1309,6437,33264,177260,968349]
