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A051010 as a triangular array

0
01
012
0112
01232
011122
0122332
01131422
012123232
0112213322
01233234432
011113142222
0122242353332
01132321343

A051010 as a square array

00000000000000
1111111111111
212121212121
23123123123
2231223122
234312343
22233122
2334431
224253
23234
2233
23
2
00000000000000
1111111111111
212121212121
23123123123
2231223122
234312343
22233122
2334431
224253
23234
2233
23
2