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A137688 as a simple table

na(n)
01
12
22
34
44
54
68
78
88
98
1016
1116
1216
1316
1416
1532
1632
1732
1832
1932
2032
2164
2264
2364
2464
2564
2664
2764
28128
29128
30128
31128
32128
33128
34128
35128
36256
37256
38256
39256
40256
41256
42256
43256
44256
45512
46512
47512
48512
49512
50512
51512
52512
53512
54512
551024
561024
571024
581024
591024
601024

[1,2,2,4,4,4,8,8,8,8,16,16,16,16,16,32,32,32,32,
 32,32,64,64,64,64,64,64,64,128,128,128,128,128,
 128,128,128,256,256,256,256,256,256,256,256,256,
 512,512,512,512,512,512,512,512,512,512,1024,1024,
 1024,1024,1024,1024]