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A121908 as a simple table

na(n)
01
12
23
39
419
572
6181
7752
82051
98902
1025417
11113249
12333101
131510888
144538219
1520853973
1663626003
17295288350
18911918665
194265460227
2013300767273
2162608960656
22196778953279
23931129725342
242945833819213
2514000655099890
2644541071348599
27212484364171847

[1,2,3,9,19,72,181,752,2051,8902,25417,113249,
 333101,1510888,4538219,20853973,63626003,
 295288350,911918665,4265460227,13300767273,
 62608960656,196778953279,931129725342,
 2945833819213,14000655099890,44541071348599,
 212484364171847]