Congruence classes of triangles which can be drawn using lattice points in n X n grid as vertices.

Terms

a(0) =0a(1) =1a(2) =8a(3) =29a(4) =79a(5) =172a(6) =333a(7) =587a(8) =963a(9) =1494a(10) =2228a(11) =3195a(12) =4455a(13) =6050a(14) =8032a(15) =10481a(16) =13464a(17) =17014a(18) =21235a(19) =26190a(20) =31980a(21) =38666a(22) =46388a(23) =55144a(24) =65131a(25) =76449a(26) =89132a(27) =103337a(28) =119184a(29) =136757