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A131795 as a simple table

na(n)
01
10
21
3-1
41
5-1
62
7-2
82
9-3
104
11-4
125
13-6
147
15-8
169
17-11
1813
19-14
2017
21-20
2222
23-25
2429
25-33
2637
27-42
2848
29-54
3061
31-68
3277
33-87
3496
35-108
36122
37-135
38150
39-168
40187
41-207
42230
43-255
44283
45-313
46345
47-382
48422
49-464
50511
51-564
52620
53-680
54748
55-821
56900
57-986
581079
59-1182
601293
61-1411
621542

[1,0,1,-1,1,-1,2,-2,2,-3,4,-4,5,-6,7,-8,9,-11,13,
 -14,17,-20,22,-25,29,-33,37,-42,48,-54,61,-68,77,
 -87,96,-108,122,-135,150,-168,187,-207,230,-255,
 283,-313,345,-382,422,-464,511,-564,620,-680,748,
 -821,900,-986,1079,-1182,1293,-1411,1542]