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A131816 as a simple table

na(n)
01
12
22
34
43
54
68
75
85
98
1016
119
127
139
1416
1532
1617
1711
1811
1917
2032
2164
2233
2319
2415
2519
2633
2764
28128
2965
3035
3123
3223
3335
3465
35128
36256
37129
3867
3939
4031
4139
4267
43129
44256
45512
46257
47131
4871
4947
5047
5171
52131
53257
54512
551024
56513
57259
58135
5979
6063
6179
62135
63259
64513
651024

[1,2,2,4,3,4,8,5,5,8,16,9,7,9,16,32,17,11,11,17,
 32,64,33,19,15,19,33,64,128,65,35,23,23,35,65,128,
 256,129,67,39,31,39,67,129,256,512,257,131,71,47,
 47,71,131,257,512,1024,513,259,135,79,63,79,135,
 259,513,1024]