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A172176 as a triangular array

1
22
121
-800-8
-31-45-4-31
-74-102222-10-74
-143-18578257-18-143
-244-28116188188116-28-244
-383-40205352401352205-40-383
-566-54330586714714586330-54-566

A172176 as a square array

121-8-31-74-143-244-383-566
220-4-10-18-28-40-54
1052257116205330
-8-42282188352586
-31-1057188401714
-74-18116352714
-143-28205586
-244-40330
-383-54
-566
121-8-31-74-143-244-383-566
220-4-10-18-28-40-54
1052257116205330
-8-42282188352586
-31-1057188401714
-74-18116352714
-143-28205586
-244-40330
-383-54
-566