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A280782
as a simple table
n
a(n)
1
1
2
2
3
6
4
15
5
42
6
99
7
262
8
633
9
1592
10
3897
11
9697
12
23767
13
58804
14
144541
[1,2,6,15,42,99,262,633,1592,3897,9697,23767, 58804,144541]