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A261035 as a simple table

na(n)
01
1-1
2-1
3-1
42
5-1
64
7-5
87
9-8
1010
11-15
1218
13-22
1426
15-37
1646
17-53
1866
19-84
20104
21-122
22148
23-183
24224
25-263
26312
27-379
28454
29-531
30626
31-750
32887
33-1034
341208
35-1428
361672
37-1936
382250
39-2633
403062
41-3529
424076
43-4728
445460
45-6264
467196
47-8290
489520
49-10875
5012431
51-14238

[1,-1,-1,-1,2,-1,4,-5,7,-8,10,-15,18,-22,26,-37,
 46,-53,66,-84,104,-122,148,-183,224,-263,312,-379,
 454,-531,626,-750,887,-1034,1208,-1428,1672,-1936,
 2250,-2633,3062,-3529,4076,-4728,5460,-6264,7196,
 -8290,9520,-10875,12431,-14238]