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A020470 as a simple table

na(n)
17
2787
3877
4887
57877
68887
778787
878877
978887
1087877
1187887
12777787
13777877
14778777
15787777
16878777
17888887
187778777
197788787
207877777
217878877
227878887
237888877
248787887
258788777
268877787
278887777
2877778887
2977787887
3077877887

[7,787,877,887,7877,8887,78787,78877,78887,87877,
 87887,777787,777877,778777,787777,878777,888887,
 7778777,7788787,7877777,7878877,7878887,7888877,
 8787887,8788777,8877787,8887777,77778887,77787887,
 77877887]