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A131375 as a triangular array

1
21
131
2341
16651
25131061
1915241571
272735402181
112286670622891
2946841411269136101

A131375 as a square array

1212121212
1336597129
1461315272846
151024356684
16154070141
172162126
182891
1936
110
1
1212121212
1336597129
1461315272846
151024356684
16154070141
172162126
182891
1936
110
1