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A231898
as a simple table
n
a(n)
1
-1
2
-1
3
2
4
-1
5
4
6
3
7
4
8
3
9
4
10
5
11
5
12
5
13
6
14
5
15
5
16
5
17
6
18
6
19
6
20
6
21
6
22
6
23
6
24
6
25
6
26
6
[-1,-1,2,-1,4,3,4,3,4,5,5,5,6,5,5,5,6,6,6,6,6,6,6, 6,6,6]