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A178596
as a simple table
n
a(n)
1
1
2
2
3
3
4
4
5
5
6
6
7
8
8
10
9
11
10
12
11
13
12
14
13
16
14
17
15
18
16
19
17
20
18
21
19
23
20
25
21
26
22
27
23
28
24
29
[1,2,3,4,5,6,8,10,11,12,13,14,16,17,18,19,20,21, 23,25,26,27,28,29]