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A138188 as a simple table

na(n)
01
1-3
20
33
4-5
50
65
7-7
80
97
10-9
110
129
13-11
140
1511
16-13
170
1813
19-15
200
2115
22-17
230
2417
25-19
260
2719
28-21
290
3021
31-23
320
3323
34-25
350
3625
37-27
380
3927
40-29
410
4229
43-31
440
4531
46-33
470
4833
49-35
500
5135
52-37
530
5437
55-39
560
5739
58-41
590
6041

[1,-3,0,3,-5,0,5,-7,0,7,-9,0,9,-11,0,11,-13,0,13,
 -15,0,15,-17,0,17,-19,0,19,-21,0,21,-23,0,23,-25,
 0,25,-27,0,27,-29,0,29,-31,0,31,-33,0,33,-35,0,35,
 -37,0,37,-39,0,39,-41,0,41]