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A131241 as a triangular array

1
31
331
3631
36931
3991231
3918121531
3121830151831
312303045182131
31530604563212431

A131241 as a square array

1333333333
136699121215
139918183030
131212303060
1315154545
13181863
132121
1324
13
1
1333333333
136699121215
139918183030
131212303060
1315154545
13181863
132121
1324
13
1