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A204154 as a triangular array

1
33
525
7447
96369
11855811
13107471013
151296691215
171411858111417
191613107710131619
2118151296912151821
23201714118811141720

A204154 as a square array

1357911131517192123
32468101214161820
54357911131517
765468101214
987657911
111098768
1312111098
1514131211
17161514
191817
2120
1357911131517192123
32468101214161820
54357911131517
765468101214
987657911
111098768
1312111098
1514131211
17161514
191817
2120