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A307781 as a simple table

na(n)
11
2-1
30
4-1
5-1
60
70
8-1
9-2
101
11-2
121
13-2
141
15-1
161
17-5
184
19-8
207
21-10
229
23-13
2412
25-15
2615
27-19
2826
29-28
3027
31-30
3229
33-34
3441
35-66
3666
37-100
3899
39-163
40170
41-223
42222
43-323
44322
45-420
46453
47-622
48621
49-771
50770
51-997
521121
53-1363
541362
55-1851
561883
57-2562
583073
59-3857
603856

[1,-1,0,-1,-1,0,0,-1,-2,1,-2,1,-2,1,-1,1,-5,4,-8,
 7,-10,9,-13,12,-15,15,-19,26,-28,27,-30,29,-34,41,
 -66,66,-100,99,-163,170,-223,222,-323,322,-420,
 453,-622,621,-771,770,-997,1121,-1363,1362,-1851,
 1883,-2562,3073,-3857,3856]