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A181977 as a simple table

na(n)
21
3-3
40
58
6-9
70
817
9-27
100
1140
12-39
130
1450
15-72
160
1796
18-81
190
20104
21-150
220
23176
24-153
250
26170
27-243
280
29280
30-216
310
32273
33-360
340
35400
36-351
370
38362
39-510
400
41560
42-450
430
44520
45-648
460
47736
48-615
490
50601
51-864
520
53936
54-729
550
56850
57-1086
580
591160

[1,-3,0,8,-9,0,17,-27,0,40,-39,0,50,-72,0,96,-81,
 0,104,-150,0,176,-153,0,170,-243,0,280,-216,0,273,
 -360,0,400,-351,0,362,-510,0,560,-450,0,520,-648,
 0,736,-615,0,601,-864,0,936,-729,0,850,-1086,0,
 1160]