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A213735 as a triangular array

1
1-1
1-31
1-67-1
1-1025-151
1-1565-9031-1
1-21140-350301-631
1-28266-10501701-966127-1
1-36462-26466951-77703025-2551
1-45750-588022827-4252534105-9330511-1

A213735 as a square array

1111111111
-1-3-6-10-15-21-28-36-45
172565140266462750
-1-15-90-350-1050-2646-5880
1313011701695122827
-1-63-966-7770-42525
1127302534105
-1-255-9330
1511
-1
1111111111
-1-3-6-10-15-21-28-36-45
172565140266462750
-1-15-90-350-1050-2646-5880
1313011701695122827
-1-63-966-7770-42525
1127302534105
-1-255-9330
1511
-1