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A343031 as a triangular array

1
23
379
4111220
515242439
61933344267
72342585471107
82754747581110160
9316690115105122164229
103575110140141143174232315
113984130165201183198244319421

A343031 as a square array

1234567891011
371115192327313539
91224334254667584
202434587490110130
39425475115140165
677181105141201
107110122143183
160164174198
229232244
315319
421
1234567891011
371115192327313539
91224334254667584
202434587490110130
39425475115140165
677181105141201
107110122143183
160164174198
229232244
315319
421