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A064520 as a simple table

na(n)
11
2-1
3-4
40
55
611
74
8-4
9-13
10-23
11-12
120
1313
1427
1542
1626
179
18-9
19-28
20-48
21-69
22-47
23-24
240
2525
2651
2778
28106
2977
3047
3116
32-16
33-49
34-83
35-118
36-154
37-117
38-79
39-40
400
4141
4283
43126
44170
45215
46169
47122
4874
4925
50-25
51-76
52-128
53-181
54-235
55-290
56-234
57-177
58-119
59-60
600
6161
62123
63186
64250
65315
66381
67314
68246
69177

[1,-1,-4,0,5,11,4,-4,-13,-23,-12,0,13,27,42,26,9,
 -9,-28,-48,-69,-47,-24,0,25,51,78,106,77,47,16,
 -16,-49,-83,-118,-154,-117,-79,-40,0,41,83,126,
 170,215,169,122,74,25,-25,-76,-128,-181,-235,-290,
 -234,-177,-119,-60,0,61,123,186,250,315,381,314,
 246,177]