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A098451
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
15
16
16
17
17
18
19
19
20
20
23
21
43
[1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,19,20, 23,43]