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A274528 as a triangular array

0
12
231
3045
41503
562174
6704829
748306510
85361741112
910624583137
1011785926141513
11812910133141516617
1291310237158511146

A274528 as a square array

0123456789101112
23016745101189
1452083671213
50143628910
3780145102
426759133
9548237
1011361415
121314158
715165
13611
1714
6
0123456789101112
23016745101189
1452083671213
50143628910
3780145102
426759133
9548237
1011361415
121314158
715165
13611
1714
6