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A087537 as a simple table

na(n)
179
297
377997979
479779979
579797997
679997977
799977797
899979777
97777997999
107779799799
117779799997
127779979979
137797799979
147797979799
157799797799
167977799799
177979799977
187979979779
197979979797
207979979977
217979997797
227997799977
237997979779
247997997977

[79,97,77997979,79779979,79797997,79997977,
 99977797,99979777,7777997999,7779799799,
 7779799997,7779979979,7797799979,7797979799,
 7799797799,7977799799,7979799977,7979979779,
 7979979797,7979979977,7979997797,7997799977,
 7997979779,7997997977]