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A337311 as a simple table

na(n)
10
20
31
4-1
51
6-1
7-1
80
9-2
102
11-2
121
13-1
14-1
150
16-2
172
18-3
193
20-3
213
22-2
231
241
250
264
27-3
284
29-2
30-2
31-1
32-3
333
34-5
352
36-2
37-2
38-1
39-3
402
41-7
422
43-5
441
450
46-2
473
48-7
491
50-3
51-9
522
53-9
542
55-6
561
57-5
58-1
59-1
60-2
613
62-9
631
64-2
65-8
664
67-5
683
69-2
70-1
711
72-2
734

[0,0,1,-1,1,-1,-1,0,-2,2,-2,1,-1,-1,0,-2,2,-3,3,
 -3,3,-2,1,1,0,4,-3,4,-2,-2,-1,-3,3,-5,2,-2,-2,-1,
 -3,2,-7,2,-5,1,0,-2,3,-7,1,-3,-9,2,-9,2,-6,1,-5,
 -1,-1,-2,3,-9,1,-2,-8,4,-5,3,-2,-1,1,-2,4]