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A088138 as a simple table

na(n)
00
11
22
30
4-8
5-16
60
764
8128
90
10-512
11-1024
120
134096
148192
150
16-32768
17-65536
180
19262144
20524288
210
22-2097152
23-4194304
240
2516777216
2633554432
270
28-134217728
29-268435456
300
311073741824
322147483648
330
34-8589934592
35-17179869184
360
3768719476736
38137438953472

[0,1,2,0,-8,-16,0,64,128,0,-512,-1024,0,4096,8192,
 0,-32768,-65536,0,262144,524288,0,-2097152,
 -4194304,0,16777216,33554432,0,-134217728,
 -268435456,0,1073741824,2147483648,0,-8589934592,
 -17179869184,0,68719476736,137438953472]