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A137408 as a simple table

na(n)
11
20
32
4-1
52
6-4
70
8-4
94
10-8
111
12-6
1316
14-16
1516
160
176
18-16
1940
20-32
2132
22-1
2312
24-44
2588
26-128
2796
28-64
290
30-8
3140
32-128
33208
34-288
35192
36-128
371
38-20
39100
40-296
41592
42-800
43832
44-512
45256
460
4710
48-80
49328
50-800
511472
52-1792
531792
54-1024
55512
56-1

[1,0,2,-1,2,-4,0,-4,4,-8,1,-6,16,-16,16,0,6,-16,
 40,-32,32,-1,12,-44,88,-128,96,-64,0,-8,40,-128,
 208,-288,192,-128,1,-20,100,-296,592,-800,832,
 -512,256,0,10,-80,328,-800,1472,-1792,1792,-1024,
 512,-1]