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A159881 as a triangular array

1
2-1
3-31
4-65-1
5-1016-81
6-1542-4012-1
7-2199-16288-171
8-28219-585514-17323-1
9-36466-19742641-1379311-301
10-45968-638812538-95363245-52138-1

A159881 as a square array

12345678910
-1-3-6-10-15-21-28-36-45
15164299219466968
-1-8-40-162-585-1974-6388
11288514264112538
-1-17-173-1379-9536
1233113245
-1-30-521
138
-1
12345678910
-1-3-6-10-15-21-28-36-45
15164299219466968
-1-8-40-162-585-1974-6388
11288514264112538
-1-17-173-1379-9536
1233113245
-1-30-521
138
-1