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A033854
as a simple table
n
a(n)
1
3
2
4
3
8
4
15
5
20
6
28
7
40
8
102
9
132
10
140
11
252
12
360
13
510
14
780
[3,4,8,15,20,28,40,102,132,140,252,360,510,780]
