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A206600 as a triangular array

15
171171
253294492532
3881055163155163138810
5978293225820012279425432258200597829
92172111886206112273276095762732760957618862061129217211
142130380110294918412608043538582223138312968770

A206600 as a square array

151712532388105978299217211142130380
1719449551631322582001886206112110294918412
2532551631122794254273276095766080435385822
38810322582002732760957623138312968770
5978291886206112
9217211
151712532388105978299217211142130380
1719449551631322582001886206112110294918412
2532551631122794254273276095766080435385822
38810322582002732760957623138312968770
5978291886206112
9217211