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A001486 as a simple table

na(n)
81
9-8
1028
11-56
1262
130
14-148
15328
16-419
17280
18140
19-728
201232
21-1336
22848
23224
24-1582
252688
26-3072
272408
28-742
29-1568
303836
31-5264
325306
33-3744
34924
352576
36-5686
377792
38-8092
396272
40-2751
41-1848
426008
43-9296
4410556
45-9800
466692
47-2240
48-3206
498168
50-11524

[1,-8,28,-56,62,0,-148,328,-419,280,140,-728,1232,
 -1336,848,224,-1582,2688,-3072,2408,-742,-1568,
 3836,-5264,5306,-3744,924,2576,-5686,7792,-8092,
 6272,-2751,-1848,6008,-9296,10556,-9800,6692,
 -2240,-3206,8168,-11524]