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A168051 as a simple table

na(n)
01
10
2-1
3-1
4-2
5-4
6-9
7-21
8-51
9-127
10-323
11-835
12-2188
13-5798
14-15511
15-41835
16-113634
17-310572
18-853467
19-2356779
20-6536382
21-18199284
22-50852019
23-142547559
24-400763223
25-1129760415
26-3192727797
27-9043402501
28-25669818476

[1,0,-1,-1,-2,-4,-9,-21,-51,-127,-323,-835,-2188,
 -5798,-15511,-41835,-113634,-310572,-853467,
 -2356779,-6536382,-18199284,-50852019,-142547559,
 -400763223,-1129760415,-3192727797,-9043402501,
 -25669818476]