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A280580 as a triangular array

1
11
261
530151
14140140281
426301050420451
132277269304620990661
429120124204242042150152002911
1430514802402403363361801804004036401201
48622187901312740245044818378366126129282061201531

A280580 as a square array

1125144213242914304862
163014063027721201251480218790
11514010506930420422402401312740
1284204620420423363362450448
145990150151801801837836
166200240040612612
191364092820
11206120
1153
1
1125144213242914304862
163014063027721201251480218790
11514010506930420422402401312740
1284204620420423363362450448
145990150151801801837836
166200240040612612
191364092820
11206120
1153
1