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A365215
as a simple table
n
a(n)
1
0
2
2
3
4
4
3
5
7
6
8
7
-1
8
9
9
10
10
12
11
16
12
-1
13
11
14
18
15
15
16
24
17
20
18
25
19
22
20
21
21
-1
22
23
[0,2,4,3,7,8,-1,9,10,12,16,-1,11,18,15,24,20,25, 22,21,-1,23]