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A186026 as a simple table

na(n)
01
11
2-2
34
48
5-16
6-32
7-64
8128
9-256
10-1536
11-3072
122048
134096
148192
15-16384
1632768
17-65536
18-393216
19-2359296
2014155776
2128311552
22-94371840
2362914560
248388608
2516777216
26-570425344
27-1140850688
28-134217728
29268435456
30-8053063680
3116106127360
322147483648
33-4294967296
34111669149696
35670014898176
36927712935936
375566277615616

[1,1,-2,4,8,-16,-32,-64,128,-256,-1536,-3072,2048,
 4096,8192,-16384,32768,-65536,-393216,-2359296,
 14155776,28311552,-94371840,62914560,8388608,
 16777216,-570425344,-1140850688,-134217728,
 268435456,-8053063680,16106127360,2147483648,
 -4294967296,111669149696,670014898176,
 927712935936,5566277615616]