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A249572 as a simple table

na(n)
01
14
28
348
488
5488
6888
74888
88888
948888
1088888
11488888
12888888
134888888
148888888
1548888888
1688888888
17488888888
18888888888
194888888888
208888888888
2148888888888
2288888888888
23488888888888
24888888888888
254888888888888
268888888888888
2748888888888888

[1,4,8,48,88,488,888,4888,8888,48888,88888,488888,
 888888,4888888,8888888,48888888,88888888,
 488888888,888888888,4888888888,8888888888,
 48888888888,88888888888,488888888888,888888888888,
 4888888888888,8888888888888,48888888888888]