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A128640 as a simple table

na(n)
11
2-4
310
4-20
539
6-76
7140
8-244
9415
10-696
111140
12-1820
132861
14-4448
156816
16-10292
1715372
18-22756
1933356
20-48408
2169683
22-99600
23141312
24-199036
25278557
26-387608
27536230
28-737632
291009464
30-1374888
311863764
32-2514868
333378948
34-4521672
356027000
36-8002676

[1,-4,10,-20,39,-76,140,-244,415,-696,1140,-1820,
 2861,-4448,6816,-10292,15372,-22756,33356,-48408,
 69683,-99600,141312,-199036,278557,-387608,536230,
 -737632,1009464,-1374888,1863764,-2514868,3378948,
 -4521672,6027000,-8002676]