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A070221 as a simple table

na(n)
21
3-1
43
5-2
64
7-5
81
92
106
11-8
1210
13-6
14-2
15-3
1615
17-14
1816
19-14
202
214
2212
23-20
242
258
26-10
274
2822
29-24
3026
31-29
329
336
34-10
35-4
3634
37-18
38-6
39-8
4036
41-34
4236
43-32
44-6
4518
4624
47-44
484
49-2
5012
51-4
5240
53-50
548
55-4
5612
5710
5830
59-54
6056
61-30
62-24
63-5
6411
65-2
6656
67-50
686
69-16
7064
71-68
7270
73-36
74-32
7514
76-8
772
7866
79-74
80-2
8138
8242
83-76

[1,-1,3,-2,4,-5,1,2,6,-8,10,-6,-2,-3,15,-14,16,
 -14,2,4,12,-20,2,8,-10,4,22,-24,26,-29,9,6,-10,-4,
 34,-18,-6,-8,36,-34,36,-32,-6,18,24,-44,4,-2,12,
 -4,40,-50,8,-4,12,10,30,-54,56,-30,-24,-5,11,-2,
 56,-50,6,-16,64,-68,70,-36,-32,14,-8,2,66,-74,-2,
 38,42,-76]