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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]

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Last modified August 16 13:06 EDT 2024. Contains 375174 sequences. (Running on oeis4.)