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A228863 as a simple table

na(n)
11
2-1
31
4-2
53
6-4
76
8-10
918
10-35
1171
12-147
13303
14-616
151244
16-2508
175067
18-10296
1921097
20-43624
2190929
22-190629
23401053
24-845374
251784015
26-3768964
277973941
28-16902610
2935909941
30-76473042
31163227753
32-349117291
33748032779
34-1605215441
353449280634
36-7420879949
3715984045722

[1,-1,1,-2,3,-4,6,-10,18,-35,71,-147,303,-616,
 1244,-2508,5067,-10296,21097,-43624,90929,-190629,
 401053,-845374,1784015,-3768964,7973941,-16902610,
 35909941,-76473042,163227753,-349117291,748032779,
 -1605215441,3449280634,-7420879949,15984045722]