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A248809 as a triangular array

1
21
321
8721
15181221
4857301821
105174141442521
384561414285603321
94519501830810510784221
38406555609046801410840985221
1039525290266851500010290

A248809 as a square array

12381548105384945384010395
12718571745611950655525290
1212301414141830609026685
121844285810468015000
122560510141010290
123378840
124298
1252
12
1
12381548105384945384010395
12718571745611950655525290
1212301414141830609026685
121844285810468015000
122560510141010290
123378840
124298
1252
12
1