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A204094 as a simple table

na(n)
00
17
270
377
4700
5707
6770
7777
87000
97007
107070
117077
127700
137707
147770
157777
1670000
1770007
1870070
1970077
2070700
2170707
2270770
2370777
2477000
2577007
2677070
2777077
2877700
2977707
3077770
3177777
32700000
33700007
34700070
35700077
36700700
37700707
38700770
39700777

[0,7,70,77,700,707,770,777,7000,7007,7070,7077,
 7700,7707,7770,7777,70000,70007,70070,70077,70700,
 70707,70770,70777,77000,77007,77070,77077,77700,
 77707,77770,77777,700000,700007,700070,700077,
 700700,700707,700770,700777]