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A256291 as a simple table

na(n)
15
26
355
456
565
666
7555
8556
9565
10566
11655
12656
13665
14666
155555
165556
175565
185566
195655
205656
215665
225666
236555
246556
256565
266566
276655
286656
296665
306666
3155555
3255556
3355565
3455566
3555655
3655656
3755665
3855666
3956555
4056556

[5,6,55,56,65,66,555,556,565,566,655,656,665,666,
 5555,5556,5565,5566,5655,5656,5665,5666,6555,6556,
 6565,6566,6655,6656,6665,6666,55555,55556,55565,
 55566,55655,55656,55665,55666,56555,56556]