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A131440 as a triangular array

1
3-1
15-51
35-357-1
315-10563-31
693-1155231-3311-1
3003-30033003-143143-131
6435-150159009-2145715-131-1
109395-3646551051-729312155-22117-171
230945-692835138567-4618946189-4199323-32319-1

A131440 as a square array

13153531569330036435109395230945
-1-5-35-105-1155-3003-15015-36465-692835
17632313003900951051138567
-1-3-33-143-2145-7293-46189
1111437151215546189
-1-13-13-221-4199
1117323
-1-17-323
119
-1
13153531569330036435109395230945
-1-5-35-105-1155-3003-15015-36465-692835
17632313003900951051138567
-1-3-33-143-2145-7293-46189
1111437151215546189
-1-13-13-221-4199
1117323
-1-17-323
119
-1