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A078107
as a simple table
n
a(n)
1
1
2
2
3
3
4
4
5
5
6
6
7
7
8
8
9
9
10
10
11
11
12
12
13
13
14
14
15
18
16
19
17
20
18
21
19
22
20
24
[1,2,3,4,5,6,7,8,9,10,11,12,13,14,18,19,20,21,22, 24]