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A124731 as a triangular array

1
21
432
87102
161534124
32319846324
6463258144156368
128127642402600192888
2562551538104420047925609616

A124731 as a square array

1248163264128256
137153163127255
21034982586421538
212461444021044
4321566002004
436192792
888560
896
16
1248163264128256
137153163127255
21034982586421538
212461444021044
4321566002004
436192792
888560
896
16