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A286921 as a triangular array

1
110
1552575
1550253000250525000
15050250075002500255000002500000075000000
1505002500300000250002775000000250000002550000000002500000000502500000000000
1500500250000750000250000250500000000250000000000750000000000250000000000250500000000000000250000000000000000750000000000000000

A286921 as a square array

1111111
1055550505050500500500
2575253000250075002500300000250000750000
250525000250025500000250002775000000250000250500000000
250000007500000025000000255000000000250000000000750000000000
2500000000502500000000000250000000000250500000000000000
250000000000000000750000000000000000
1111111
1055550505050500500500
2575253000250075002500300000250000750000
250525000250025500000250002775000000250000250500000000
250000007500000025000000255000000000250000000000750000000000
2500000000502500000000000250000000000250500000000000000
250000000000000000750000000000000000