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A076880 as a simple table

na(n)
01
12
20
3-2
42
50
6-8
7-16
80
916
10-16
110
1216
1332
140
15-32
16-16
170
1864
19128
200
21-512
222048
230
24-8192
258192
260
27-8192
288192
290
30-8192
31-16384
320
3316384
348192
350
36-8192
37-16384
380
3965536
40-262144
410
421048576
43-1048576
440
451048576
46524288
470
48-131072
49131072
500
51-32768
528192
530
54-32768
55-65536
560
57262144

[1,2,0,-2,2,0,-8,-16,0,16,-16,0,16,32,0,-32,-16,0,
 64,128,0,-512,2048,0,-8192,8192,0,-8192,8192,0,
 -8192,-16384,0,16384,8192,0,-8192,-16384,0,65536,
 -262144,0,1048576,-1048576,0,1048576,524288,0,
 -131072,131072,0,-32768,8192,0,-32768,-65536,0,
 262144]