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A251909 as a triangular array

9552
8747287472
9106941524496910694
938521031829596318295969385210
97416802634891856134687572863489185697416802
1020849168130212219765515995929655159959296130212219761020849168
10715275730

A251909 as a square array

955287472910694938521097416802102084916810715275730
8747215244963182959663489185613021221976
91069431829596134687572855159959296
938521063489185655159959296
9741680213021221976
1020849168
955287472910694938521097416802102084916810715275730
8747215244963182959663489185613021221976
91069431829596134687572855159959296
938521063489185655159959296
9741680213021221976
1020849168