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A061059
as a simple table
n
a(n)
1
2
2
3
3
6
4
15
5
55
6
182
7
715
8
3135
9
15015
10
81345
11
448630
12
2733549
[2,3,6,15,55,182,715,3135,15015,81345,448630, 2733549]