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A121545 as a simple table

na(n)
00
11
21
34
417
581
6412
72192
812049
967891
10390041
112276176
1213455356
1380402284
14484865032
152947107384
1618036248337
17111046920567
18687345582787
194274642610932
2026697307240777
21167377288848977

[0,1,1,4,17,81,412,2192,12049,67891,390041,
 2276176,13455356,80402284,484865032,2947107384,
 18036248337,111046920567,687345582787,
 4274642610932,26697307240777,167377288848977]