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A131896 as a triangular array

1
43
945
16567
256789
367891011
498910111213
649101112131415
811011121314151617
100111213141516171819

A131896 as a square array

149162536496481100
34567891011
56789101112
78910111213
91011121314
1112131415
13141516
151617
1718
19
149162536496481100
34567891011
56789101112
78910111213
91011121314
1112131415
13141516
151617
1718
19