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A002841
as a simple table
n
a(n)
3
1
4
1
5
2
6
6
7
16
8
50
9
165
10
554
11
1908
12
6667
13
23556
14
84048
15
302404
16
1095536
17
3993623
[1,1,2,6,16,50,165,554,1908,6667,23556,84048, 302404,1095536,3993623]