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A281487 as a simple table

na(n)
11
2-1
30
4-1
51
6-2
72
8-3
94
10-5
114
12-5
138
14-9
157
16-9
1713
18-14
1912
20-13
2118
22-21
2317
24-18
2529
26-31
2723
28-28
2936
30-37
3136
32-37
3350
34-55
3542
36-46
3764
38-65
3953
40-62
4183
42-84
4375
44-76
4594
46-107
4790
48-91
49129
50-132
51107
52-121
53145
54-146
55135
56-141
57180
58-193
59157

[1,-1,0,-1,1,-2,2,-3,4,-5,4,-5,8,-9,7,-9,13,-14,
 12,-13,18,-21,17,-18,29,-31,23,-28,36,-37,36,-37,
 50,-55,42,-46,64,-65,53,-62,83,-84,75,-76,94,-107,
 90,-91,129,-132,107,-121,145,-146,135,-141,180,
 -193,157]