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A099211 as a simple table

na(n)
01
1-2
24
3-4
40
516
6-48
796
8-128
964
10256
11-1024
122304
13-3584
143072
153072
16-20480
1753248
18-94208
19106496
200
21-376832
221179648
23-2359296
243211264
25-1703936
26-6029312
2724903680
28-56623104
2989128960
30-78643200
31-69206016

[1,-2,4,-4,0,16,-48,96,-128,64,256,-1024,2304,
 -3584,3072,3072,-20480,53248,-94208,106496,0,
 -376832,1179648,-2359296,3211264,-1703936,
 -6029312,24903680,-56623104,89128960,-78643200,
 -69206016]