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A248829 as a simple table

na(n)
01
1-1
21
3-1
4-7
51
6-1
729
8-17
91
10-1
11-99
12175
13-31
141
15-1
16301
17-1425
18569
19-49
201
21-1
22-851
2310095
24-8071
251391
26-71
271
28-1
292285
30-65169
3197769
32-29969
332869
34-97
351
36-1
37-5907
38393583
39-1063447
40543471
41-86731
425279
43-127
441
45-1
4614829
47-2260625
4810693865
49-8746257
502181269
51-212449
528945
53-161
541
55-1
56-36371
5712484975
58-101280535
59128879343
60-48218731
617045151
62-461455
6314239
64-199
651

[1,-1,1,-1,-7,1,-1,29,-17,1,-1,-99,175,-31,1,-1,
 301,-1425,569,-49,1,-1,-851,10095,-8071,1391,-71,
 1,-1,2285,-65169,97769,-29969,2869,-97,1,-1,-5907,
 393583,-1063447,543471,-86731,5279,-127,1,-1,
 14829,-2260625,10693865,-8746257,2181269,-212449,
 8945,-161,1,-1,-36371,12484975,-101280535,
 128879343,-48218731,7045151,-461455,14239,-199,1]