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A106603 as a simple table

na(n)
01
11
2-2
3-4
40
516
60
70
8-128
9256
10-512
112048
12-6144
1316384
14-49152
15147456
16-425984
171245184
18-3670016
1910747904
20-31457280
2192274688
22-270532608
23792723456
24-2323644416
256811549696
26-19964887040
2758518929408
28-171530256384
29502779609088
30-1473710653440
314319663357952

[1,1,-2,-4,0,16,0,0,-128,256,-512,2048,-6144,
 16384,-49152,147456,-425984,1245184,-3670016,
 10747904,-31457280,92274688,-270532608,792723456,
 -2323644416,6811549696,-19964887040,58518929408,
 -171530256384,502779609088,-1473710653440,
 4319663357952]