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A119079 as a simple table

na(n)
16
255
366
4666
55050
65565
76555
866066
9500500
10600060
11605550
125656566
1350005000
1460505500
155000050000
166050055000
17500000500000
18605000550000
1950000005000000
2060500005500000
2166605656050060
22550006056055665
23555665666566566
245000000050000000

[6,55,66,666,5050,5565,6555,66066,500500,600060,
 605550,5656566,50005000,60505500,5000050000,
 6050055000,500000500000,605000550000,
 50000005000000,60500005500000,66605656050060,
 550006056055665,555665666566566,5000000050000000]