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A051535 as a simple table

na(n)
01
12
24
38
416
532
664
7128
8256
9512
101000
112000
124000
138000
1416000
1532000
1664000
17128000
18256000
19512000
201000000
212000000
224000000
238000000
2416000000
2532000000
2664000000
27128000000
28256000000
29512000000
301000000000
312000000000

[1,2,4,8,16,32,64,128,256,512,1000,2000,4000,8000,
 16000,32000,64000,128000,256000,512000,1000000,
 2000000,4000000,8000000,16000000,32000000,
 64000000,128000000,256000000,512000000,1000000000,
 2000000000]