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A251912 as a triangular array

49436
950384950384
182458243409638418245824
35104000412284808001228480800351040004
67553761724452782391283861378128445278239126755376172
130017259448161834827461258011036108525801103610852

A251912 as a square array

49436950384182458243510400046755376172130017259448
950384340963841228480800445278239121618348274612
182458241228480800838613781285801103610852
351040004445278239125801103610852
6755376172
49436950384182458243510400046755376172130017259448
950384340963841228480800445278239121618348274612
182458241228480800838613781285801103610852
351040004445278239125801103610852
6755376172