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A031501 as a triangular array

1
23
346
4579
5681012
679121416
781013151821
89111417192225
91012151821242730
10111316202225293235
1112141721242730343740
12131518222528

A031501 as a square array

123456789101112
345678910111213
6789101112131415
91012131415161718
1214151718202122
16181921222425
212224252728
25272930
303234
3537
40
123456789101112
345678910111213
6789101112131415
91012131415161718
1214151718202122
16181921222425
212224252728
25272930
303234
3537
40