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A171998 as a triangular array

1
11
131
-5761
-65-1525101
-455-455065151
-1295-4725-1715140140211

A171998 as a square array

111-5-65-455-1295
137-15-455-4725
16250-1715
11065140
115140
121
1
111-5-65-455-1295
137-15-455-4725
16250-1715
11065140
115140
121
1