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A078246 as a simple table

na(n)
17
270
3777
4700
570
67770
77
87000
9777777777
1070
1177
1277700
137007
1470
157770
1670000
1777707
187777777770
1977007
20700
21777
22770
23770707
24777000
25700
2670070
277707777777
28700
297707707
307770
31777077
32700000
33777777
34777070
3570
3677777777700
37777
38770070

[7,70,777,700,70,7770,7,7000,777777777,70,77,
 77700,7007,70,7770,70000,77707,7777777770,77007,
 700,777,770,770707,777000,700,70070,7707777777,
 700,7707707,7770,777077,700000,777777,777070,70,
 77777777700,777,770070]