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A081360 as a simple table

na(n)
01
1-1
21
3-2
42
5-3
64
7-5
86
9-8
1010
11-12
1215
13-18
1422
15-27
1632
17-38
1846
19-54
2064
21-76
2289
23-104
24122
25-142
26165
27-192
28222
29-256
30296
31-340
32390
33-448
34512
35-585
36668
37-760
38864
39-982
401113
41-1260
421426
43-1610
441816
45-2048
462304
47-2590
482910
49-3264
503658
51-4097
524582
53-5120
545718
55-6378

[1,-1,1,-2,2,-3,4,-5,6,-8,10,-12,15,-18,22,-27,32,
 -38,46,-54,64,-76,89,-104,122,-142,165,-192,222,
 -256,296,-340,390,-448,512,-585,668,-760,864,-982,
 1113,-1260,1426,-1610,1816,-2048,2304,-2590,2910,
 -3264,3658,-4097,4582,-5120,5718,-6378]