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A124476 as a simple table

na(n)
167
276
36777
476
57776
66776
7776
86777
96677
107776
11676
126776
137776
146766
157776
1676
1767767
186776
19667
207776
21676
226777
236776
24667
2567766
267776
2766777777
286766
297776
30666777
3176
3277766
337667
3476776
35676777
366776
3767666
38667776
397776
4067767
4167677

[67,76,6777,76,7776,6776,776,6777,6677,7776,676,
 6776,7776,6766,7776,76,67767,6776,667,7776,676,
 6777,6776,667,67766,7776,66777777,6766,7776,
 666777,76,77766,7667,76776,676777,6776,67666,
 667776,7776,67767,67677]