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A307060 as a simple table

na(n)
01
1-1
21
3-2
44
5-7
612
7-21
838
9-68
10120
11-212
12377
13-670
141188
15-2107
163740
17-6638
1811778
19-20898
2037084
21-65808
22116775
23-207212
24367696
25-652478
261157815
27-2054524
283645730
29-6469316
3011479734
31-20370656
3236147506
33-64143372
34113821732
35-201975429
36358403220
37-635982680
381128544452
39-2002589998

[1,-1,1,-2,4,-7,12,-21,38,-68,120,-212,377,-670,
 1188,-2107,3740,-6638,11778,-20898,37084,-65808,
 116775,-207212,367696,-652478,1157815,-2054524,
 3645730,-6469316,11479734,-20370656,36147506,
 -64143372,113821732,-201975429,358403220,
 -635982680,1128544452,-2002589998]