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A132728 as a triangular array

1
17
171
1717
17171
171717
1717171
17171717
171717171
1717171717
17171717171

A132728 as a square array

11111111111
7777777777
111111111
77777777
1111111
777777
11111
7777
111
77
1
11111111111
7777777777
111111111
77777777
1111111
777777
11111
7777
111
77
1

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Last modified September 22 11:40 EDT 2024. Contains 376114 sequences. (Running on oeis4.)