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A273897 as a triangular array

1
11
221
4531
912941
2230251451
577869442061
154210192133702771
4295825423962301043581
12231651155411767313691474491
35504772452135042285124856020054101

A273897 as a square array

11249225715442912233550
12512307821058216514772
139256919254215544521
14144413339611763504
1520702307312285
16271043691248
1735147560
1844200
1954
110
1
11249225715442912233550
12512307821058216514772
139256919254215544521
14144413339611763504
1520702307312285
16271043691248
1735147560
1844200
1954
110
1