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A221960 as a simple table

na(n)
11
21
3-1
41
50
6-3
72
81
90
100
11-4
12-3
1312
14-6
151
160
170
180
19-5
20-10
2120
2230
23-60
2424
251
260
270
280
290
30-6
31-15
3220
33120
34-90
35-270
36360
37-120

[1,1,-1,1,0,-3,2,1,0,0,-4,-3,12,-6,1,0,0,0,-5,-10,
 20,30,-60,24,1,0,0,0,0,-6,-15,20,120,-90,-270,360,
 -120]