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A176981 as a simple table

na(n)
01
10
2-1
3-2
4-5
5-12
6-29
7-70
8-169
9-408
10-985
11-2378
12-5741
13-13860
14-33461
15-80782
16-195025
17-470832
18-1136689
19-2744210
20-6625109
21-15994428
22-38613965
23-93222358
24-225058681
25-543339720
26-1311738121
27-3166815962
28-7645370045

[1,0,-1,-2,-5,-12,-29,-70,-169,-408,-985,-2378,
 -5741,-13860,-33461,-80782,-195025,-470832,
 -1136689,-2744210,-6625109,-15994428,-38613965,
 -93222358,-225058681,-543339720,-1311738121,
 -3166815962,-7645370045]