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A138601
as a simple table
n
a(n)
1
20
2
21
3
24
4
30
5
66
6
74
7
390
8
1194
9
1244
10
2166
11
2580
12
4488
[20,21,24,30,66,74,390,1194,1244,2166,2580,4488]
