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A089075 as a simple table

na(n)
1-1
21
3-1
42
5-2
64
7-4
87
9-7
1012
11-12
1222
13-21
1439
15-39
1668
17-70
18119
19-127
20210
21-229
22369
23-413
24649
25-742
261143
27-1334
282017
29-2393
303561
31-4289
326293
33-7680
3411129
35-13739
3619696
37-24559
3834879
39-43871
4061801
41-78324
42109555
43-139764
44194291
45-249295
46344694
47-444496
48611723
49-792285

[-1,1,-1,2,-2,4,-4,7,-7,12,-12,22,-21,39,-39,68,
 -70,119,-127,210,-229,369,-413,649,-742,1143,
 -1334,2017,-2393,3561,-4289,6293,-7680,11129,
 -13739,19696,-24559,34879,-43871,61801,-78324,
 109555,-139764,194291,-249295,344694,-444496,
 611723,-792285]