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A213221 as a triangular array

1
21
631
181041
58321551
192106522161
650357180792871
223212226242881143681
77464230217810354391584591
270961477076483706164264321255101

A213221 as a square array

12618581926502232774627096
1310321063571222423014770
14155218062421787648
15217928810353706
16281144391642
1736158643
1845212
1955
110
1
12618581926502232774627096
1310321063571222423014770
14155218062421787648
15217928810353706
16281144391642
1736158643
1845212
1955
110
1