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A016020 as a simple table

na(n)
01
12
24
38
416
532
66
7128
8256
9512
101024
1112
124096
138192
1416384
1532768
1624
17131072
18262144
19524288
2036
2148
224194304
238388608
2416777216
2533554432
2696
27134217728
28268435456
2972
301073741824
3130
324294967296
338589934592
3417179869184

[1,2,4,8,16,32,6,128,256,512,1024,12,4096,8192,
 16384,32768,24,131072,262144,524288,36,48,4194304,
 8388608,16777216,33554432,96,134217728,268435456,
 72,1073741824,30,4294967296,8589934592,
 17179869184]