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A287274 as a triangular array

1
33
7117
15515115
3122742122731
639633615361596363
12739713051759747305173971127
2551613125223198929598929525223116131255
511650272054941162191873226038116219187205494165027511

A287274 as a square array

137153163127255511
3115122796339711613165027
7514213615305172522312054941
1522736155974798929516219187
319633051798929532260381
63397125223116219187
127161312054941
25565027
511
137153163127255511
3115122796339711613165027
7514213615305172522312054941
1522736155974798929516219187
319633051798929532260381
63397125223116219187
127161312054941
25565027
511