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A048505 as a triangular array

1
21
751
2518101
815635171
24116010158261
67343226916087371
17931120685408233122501
4609281616931000577320163651
115216912409323921377776421

A048505 as a square array

12725812416731793460911521
151856160432112028166912
1103510126968516934093
1175816040810002392
126872335771377
137122320776
150163421
165
1
12725812416731793460911521
151856160432112028166912
1103510126968516934093
1175816040810002392
126872335771377
137122320776
150163421
165
1