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A261596 as a triangular array

0
00
000
0000
00000
246135
2514736
35281746
249753168
24681013579

A261596 as a square array

0000022322
000045544
00061296
0014878
0371510
53731
6413
665
87
9
0000022322
000045544
00061296
0014878
0371510
53731
6413
665
87
9