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A131875 as a triangular array

1
54
1257
226810
35791113
51810121416
7091113151719
9210121416182022
1171113151719212325
145121416182022242628

A131875 as a square array

15122235517092117145
456789101112
7891011121314
10111213141516
131415161718
1617181920
19202122
222324
2526
28
15122235517092117145
456789101112
7891011121314
10111213141516
131415161718
1617181920
19202122
222324
2526
28