Minimal scope of an (n,2) difference triangle.

Terms

a(0) =3a(1) =7a(2) =10a(3) =12a(4) =15a(5) =19a(6) =22a(7) =24a(8) =27a(9) =31a(10) =34a(11) =36a(12) =39a(13) =43a(14) =46a(15) =48a(16) =51a(17) =55a(18) =58a(19) =60a(20) =63a(21) =67a(22) =70a(23) =72a(24) =75a(25) =79a(26) =82a(27) =84a(28) =87a(29) =91