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A115413 as a simple table

na(n)
0-1
11
2-1
32
4-1
51
6-1
7-1
81
9-2
104
11-3
124
13-4
141
15-1
16-2
176
18-6
1910
20-11
218
22-9
233
244
25-7
2618
27-23
2824
29-30
3022
31-13
325
3319
34-34
3549
36-71
3769
38-67
3957
40-16
41-16
4263
43-124
44152
45-187
46197
47-152
48108
49-10
50-124
51231
52-374
53473
54-491
55492
56-359
57136
58113
59-488
60828
61-1096
621339
63-1323
641119
65-738
667
67805
68-1697
692655

[-1,1,-1,2,-1,1,-1,-1,1,-2,4,-3,4,-4,1,-1,-2,6,-6,
 10,-11,8,-9,3,4,-7,18,-23,24,-30,22,-13,5,19,-34,
 49,-71,69,-67,57,-16,-16,63,-124,152,-187,197,
 -152,108,-10,-124,231,-374,473,-491,492,-359,136,
 113,-488,828,-1096,1339,-1323,1119,-738,7,805,
 -1697,2655]