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A256340 as a simple table

na(n)
17
28
377
478
587
688
7777
8778
9787
10788
11877
12878
13887
14888
157777
167778
177787
187788
197877
207878
217887
227888
238777
248778
258787
268788
278877
288878
298887
308888
3177777
3277778
3377787
3477788
3577877
3677878
3777887
3877888
3978777
4078778
4178787
4278788
4378877
4478878

[7,8,77,78,87,88,777,778,787,788,877,878,887,888,
 7777,7778,7787,7788,7877,7878,7887,7888,8777,8778,
 8787,8788,8877,8878,8887,8888,77777,77778,77787,
 77788,77877,77878,77887,77888,78777,78778,78787,
 78788,78877,78878]