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A216406 as a simple table

na(n)
01
1-4
20
38
416
5-8
6-48
7-56
80
9116
10256
11264
12-32
13-648
14-1296
15-1392
16-352
172040
185200
197368
206112
21-784
22-13744
23-29304
24-39648
25-33804
26-1376
2760368
28139552
29205304
30210208
31103432
32-146528
33-521744
34-928480
35-1190000
36-1069904
37-339720
381110864
393146640
405278624

[1,-4,0,8,16,-8,-48,-56,0,116,256,264,-32,-648,
 -1296,-1392,-352,2040,5200,7368,6112,-784,-13744,
 -29304,-39648,-33804,-1376,60368,139552,205304,
 210208,103432,-146528,-521744,-928480,-1190000,
 -1069904,-339720,1110864,3146640,5278624]