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A167387 as a simple table

na(n)
21
3-2
40
510
6-35
784
8-168
9300
10-495
11770
12-1144
131638
14-2275
153080
16-4080
175304
18-6783
198550
20-10640
2113090
22-15939
2319228
24-23000
2527300
26-32175
2737674
28-43848
2950750
30-58435
3166960
32-76384
3386768
34-98175
35110670
36-124320
37139194
38-155363
39172900

[1,-2,0,10,-35,84,-168,300,-495,770,-1144,1638,
 -2275,3080,-4080,5304,-6783,8550,-10640,13090,
 -15939,19228,-23000,27300,-32175,37674,-43848,
 50750,-58435,66960,-76384,86768,-98175,110670,
 -124320,139194,-155363,172900]