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A008940
as a simple table
n
a(n)
1
1
2
20
3
21
4
28
5
28
6
28
7
84
8
105
9
125
10
126
11
126
12
126
13
144
14
144
[1,20,21,28,28,28,84,105,125,126,126,126,144,144]