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A013988 as a triangular array

1
51
55151
935295301
215057425925501
623645229405324002225751
218275758423415129860510360045501051
89493057535876417559069010523540527195083301401
4206173702517398082625301686962528942683016929255621810140701801

A013988 as a square array

1555935215056236452182757589493057542061737025
1152957425229405842341535876417517398082625
130925324001298605590690103016869625
15022251036005235405289426830
175455027195016929255
11058330621810
114014070
1180
1
1555935215056236452182757589493057542061737025
1152957425229405842341535876417517398082625
130925324001298605590690103016869625
15022251036005235405289426830
175455027195016929255
11058330621810
114014070
1180
1