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A181539 as a simple table

na(n)
19
249
3249
41249
518751
6218751
7781249
824218751
974218751
101425781249
1113574218751
12163574218751
13163574218751
1419836425781249
1519836425781249
162480163574218751
1712519836425781249
1812519836425781249
19487480163574218751
2015487480163574218751
21215487480163574218751
22215487480163574218751

[9,49,249,1249,18751,218751,781249,24218751,
 74218751,1425781249,13574218751,163574218751,
 163574218751,19836425781249,19836425781249,
 2480163574218751,12519836425781249,
 12519836425781249,487480163574218751,
 15487480163574218751,215487480163574218751,
 215487480163574218751]