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A257635 as a triangular array

1
21
1271
12074151
16801066251261
30240195245000635401
665280434568117454168151345571
17297280113938083197348495544458152527771
5189184003439764009923655616275700165988910780043541001

A257635 as a square array

121212016803024066528017297280518918400
177410661952443456811393808343976400
1152515000117454319734899236556
1266351681549554416275700
1401345458151659889
1572527107800
1774354
1100
1
121212016803024066528017297280518918400
177410661952443456811393808343976400
1152515000117454319734899236556
1266351681549554416275700
1401345458151659889
1572527107800
1774354
1100
1