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A055215 as a triangular array

1
11
111
1121
11221
112321
1123421
11235421
112357421
1123588421
112358128421
11235813158421
112358132016

A055215 as a square array

1111111111111
111111111111
12222222222
1233333333
124555555
12478888
1248121313
12481520
124816
124
12
1

A055215 as an upper right triangle

1111111111111
111111111111
12222222222
1233333333
124555555
12478888
1248121313
12481520
124816
124
12
1

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Last modified August 6 17:06 EDT 2020. Contains 336255 sequences. (Running on oeis4.)