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A106397 as a simple table

na(n)
01
11
20
3-3
4-11
5-30
6-72
7-162
8-353
9-756
10-1598
11-3334
12-6868
13-14002
14-28368
15-57374
16-116233
17-236165
18-480781
19-978293
20-1984231
21-4003365
22-8028201
23-16011129
24-31812545
25-63129395
26-125452526
27-250216779
28-501567302

[1,1,0,-3,-11,-30,-72,-162,-353,-756,-1598,-3334,
 -6868,-14002,-28368,-57374,-116233,-236165,
 -480781,-978293,-1984231,-4003365,-8028201,
 -16011129,-31812545,-63129395,-125452526,
 -250216779,-501567302]