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A123876 as a triangular array

1
-21
4-51
-818-81
16-5641-111
-32160-17073-141
64-432620-377114-171
-1281120-20721666-704164-201
256-28166496-66083649-1178223-231
-5126912-1939224192-167227001-1826291-261

A123876 as a square array

1-24-816-3264-128256-512
1-518-56160-4321120-28166912
1-841-170620-20726496-19392
1-1173-3771666-660824192
1-14114-7043649-16722
1-17164-11787001
1-20223-1826
1-23291
1-26
1
1-24-816-3264-128256-512
1-518-56160-4321120-28166912
1-841-170620-20726496-19392
1-1173-3771666-660824192
1-14114-7043649-16722
1-17164-11787001
1-20223-1826
1-23291
1-26
1