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A307886 as a simple table

na(n)
11
2-4
3-4
41
51
61
7-24
826
9-9
101
111
12-109
13-49
141
151
161
17-524
18246
19-29
201
211
22-2504
23-619
24-4
251
261
27-11979
282621
29-99
301
311
32-57299
33-7774
34-34
351
361
37-274084
3830126
39-349
401
411
42-1311049
43-97879
44-179
451
461
47-6271254
48363131
49-1254
501
511
52-29997829
53-1237504
54-824
551

[1,-4,-4,1,1,1,-24,26,-9,1,1,-109,-49,1,1,1,-524,
 246,-29,1,1,-2504,-619,-4,1,1,-11979,2621,-99,1,1,
 -57299,-7774,-34,1,1,-274084,30126,-349,1,1,
 -1311049,-97879,-179,1,1,-6271254,363131,-1254,1,
 1,-29997829,-1237504,-824,1]