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A204012 as a triangular array

1
22
353
4664
57975
68101086
7911131197
81012141412108
9111315171513119
10121416181816141210
1113151719211917151311
121416182022222018

A204012 as a square array

123456789101112
2567891011121314
36910111213141516
4710131415161718
58111417181920
691215182122
71013161922
811141720
9121518
1013
11
123456789101112
2567891011121314
36910111213141516
4710131415161718
58111417181920
691215182122
71013161922
811141720
9121518
1013
11