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A018137 as a simple table

na(n)
01
12
23
34
46
58
613
719
828
943
1064
1198
12148
13223
14338
15512
16777
171177
181783
192703
204096
216209
229411
2314264
2421619
2532768
2649668
2775282
28114105
29172951
30262144
31397337
32602249
33912839
341383605
352097152

[1,2,3,4,6,8,13,19,28,43,64,98,148,223,338,512,
 777,1177,1783,2703,4096,6209,9411,14264,21619,
 32768,49668,75282,114105,172951,262144,397337,
 602249,912839,1383605,2097152]