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A281251 as a triangular array

0
00
000
112121
21394431392
912228489848912229
349151105368197429105368915134
12463138111314832919203291920111314863138124
4324120701059809947427679766706854742767910598099

A281251 as a square array

00012934124432
00121391222915163138412070
0124438489105368111314810598099
11398489197429329192047427679
21222105368329192076670685
99151111314847427679
346313810598099
124
00012934124432
00121391222915163138412070
0124438489105368111314810598099
11398489197429329192047427679
21222105368329192076670685
99151111314847427679
346313810598099
124