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A138228
as a simple table
n
a(n)
0
1
1
4
2
21
3
22
4
23
5
24
6
25
7
26
8
27
9
28
10
29
11
30
12
5
13
6
14
7
15
8
16
9
17
2
[1,4,21,22,23,24,25,26,27,28,29,30,5,6,7,8,9,2]