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A194880 as a triangular array

0
-1-1
-4-5-2
-7-8-3-10
-11-4-13-14-5
-16-17-6-19-20-7
-22-23-8-25-26-9-28
-29-10-31-32-11-34-35-12
-37-38-13-40-41-14-43-44-15
-46-47-16-49-50-17-52-53-18-55
-56-19-58-59-20

A194880 as a square array

0-1-4-7-11-16-22-29-37-46-56
-1-5-8-4-17-23-10-38-47-19
-2-3-13-6-8-31-13-16-58
-10-14-19-25-32-40-49-59
-5-20-26-11-41-50-20
-7-9-34-14-17
-28-35-43-52
-12-44-53
-15-18
-55
0-1-4-7-11-16-22-29-37-46-56
-1-5-8-4-17-23-10-38-47-19
-2-3-13-6-8-31-13-16-58
-10-14-19-25-32-40-49-59
-5-20-26-11-41-50-20
-7-9-34-14-17
-28-35-43-52
-12-44-53
-15-18
-55