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A186025 as a simple table

na(n)
01
10
2-1
3-4
4-12
5-33
6-88
7-232
8-609
9-1596
10-4180
11-10945
12-28656
13-75024
14-196417
15-514228
16-1346268
17-3524577
18-9227464
19-24157816
20-63245985
21-165580140
22-433494436
23-1134903169
24-2971215072
25-7778742048
26-20365011073
27-53316291172
28-139583862444

[1,0,-1,-4,-12,-33,-88,-232,-609,-1596,-4180,
 -10945,-28656,-75024,-196417,-514228,-1346268,
 -3524577,-9227464,-24157816,-63245985,-165580140,
 -433494436,-1134903169,-2971215072,-7778742048,
 -20365011073,-53316291172,-139583862444]