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A285350 as a simple table

na(n)
01
1-4
212
3-24
436
5-36
68
756
8-148
9228
10-228
1180
12248
13-688
141048
15-1048
16420
17896
18-2588
193920
20-3884
211648
222864
23-8488
2412744
25-12516
265440
278400
28-25176
2937480
30-36504
3116032
3222892
33-69024
34101968
35-98504
3643468
3758736
38-177584
39260416
40-249732
41110328

[1,-4,12,-24,36,-36,8,56,-148,228,-228,80,248,
 -688,1048,-1048,420,896,-2588,3920,-3884,1648,
 2864,-8488,12744,-12516,5440,8400,-25176,37480,
 -36504,16032,22892,-69024,101968,-98504,43468,
 58736,-177584,260416,-249732,110328]