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A250109 as a simple table

na(n)
1-8
20
3-20
4-20
5-64
6-48
7-120
8-120
9-232
10-208
11-364
12-364
13-576
14-544
15-816
16-816
17-1160
18-1120
19-1540
20-1540
21-2048
22-2000
23-2600
24-2600
25-3304
26-3248
27-4060
28-4060
29-4992
30-4928
31-5984
32-5984
33-7176
34-7104
35-8436
36-8436
37-9920
38-9840
39-11480
40-11480

[-8,0,-20,-20,-64,-48,-120,-120,-232,-208,-364,
 -364,-576,-544,-816,-816,-1160,-1120,-1540,-1540,
 -2048,-2000,-2600,-2600,-3304,-3248,-4060,-4060,
 -4992,-4928,-5984,-5984,-7176,-7104,-8436,-8436,
 -9920,-9840,-11480,-11480]