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A120582 as a simple table

na(n)
01
12
20
30
4-16
5-32
6-64
7-128
80
90
101024
112048
124096
138192
140
150
16-65536
17-131072
18-262144
19-524288
200
210
224194304
238388608
2416777216
2533554432
260
270
28-268435456
29-536870912
30-1073741824
31-2147483648
320
330
3417179869184
3534359738368
3668719476736
37137438953472
380
390
40-1099511627776

[1,2,0,0,-16,-32,-64,-128,0,0,1024,2048,4096,8192,
 0,0,-65536,-131072,-262144,-524288,0,0,4194304,
 8388608,16777216,33554432,0,0,-268435456,
 -536870912,-1073741824,-2147483648,0,0,
 17179869184,34359738368,68719476736,137438953472,
 0,0,-1099511627776]