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A124802 as a simple table

na(n)
21
31
41
51
63
7-1
81
96
10-4
112
121
1310
14-10
1510
16-3
171
1815
19-20
2030
21-18
225
231
2421
25-35
2670
27-63
2835
29-8
301
3128
32-56
33140
34-168
35140
36-64
3713

[1,1,1,1,3,-1,1,6,-4,2,1,10,-10,10,-3,1,15,-20,30,
 -18,5,1,21,-35,70,-63,35,-8,1,28,-56,140,-168,140,
 -64,13]