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A131950 as a triangular array

1
33
545
7667
981089
111015151011
13122126211213
1514284242281415
171636647864361617
1918459313513593451819

A131950 as a square array

135791113151719
34681012141618
56101521283645
781526426493
910214278135
11122864135
13143693
151645
1718
19
135791113151719
34681012141618
56101521283645
781526426493
910214278135
11122864135
13143693
151645
1718
19