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A131667 as a simple table

na(n)
12
2-1
30
44
5-3
60
76
8-5
90
108
11-7
120
1310
14-9
150
1612
17-11
180
1914
20-13
210
2216
23-15
240
2518
26-17
270
2820
29-19
300
3122
32-21
330
3424
35-23
360
3726
38-25
390
4028
41-27
420
4330
44-29
450
4632
47-31
480
4934
50-33
510
5236
53-35
540
5538
56-37
570
5840
59-39
600
6142
62-41
630
6444
65-43
660
6746
68-45
690
7048
71-47
720
7350
74-49
750

[2,-1,0,4,-3,0,6,-5,0,8,-7,0,10,-9,0,12,-11,0,14,
 -13,0,16,-15,0,18,-17,0,20,-19,0,22,-21,0,24,-23,
 0,26,-25,0,28,-27,0,30,-29,0,32,-31,0,34,-33,0,36,
 -35,0,38,-37,0,40,-39,0,42,-41,0,44,-43,0,46,-45,
 0,48,-47,0,50,-49,0]