Minimal scope of an (n,4) difference triangle.

Terms

a(0) =11a(1) =22a(2) =32a(3) =41a(4) =51a(5) =60a(6) =71a(7) =80a(8) =91a(9) =100a(10) =111a(11) =120a(12) =131a(13) =140a(14) =151