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A201915 as a triangular array

1
611
141523
42626977
3046515571
607892123143167
114135158177203209239
132140182188195249287299
120174184190267295319323359
204220224246284286334415451503

A201915 as a square array

1614423060114132120204
1115624678135140174220
23695192158182184224
7755123177188190246
71143203195267284
167209249295286
239287319334
299323415
359451
503
1614423060114132120204
1115624678135140174220
23695192158182184224
7755123177188190246
71143203195267284
167209249295286
239287319334
299323415
359451
503