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A213999 as a triangular array

1
12
123
1264
123125
12612606
123410207
1261220201408
123121510352809
1264203070280252010
1231210122156252252011
1261260608416850425202772012

A213999 as a square array

111111111111
22222222222
3636363636
412124121241212
560102015201060
6202010301260
714035702184
828028056168
92520252504
1025202520
1127720
12
111111111111
22222222222
3636363636
412124121241212
560102015201060
6202010301260
714035702184
828028056168
92520252504
1025202520
1127720
12