Number of similarity classes of triangles which can be drawn using the lattice points in an n X n grid for vertices.

A028492

Number of similarity classes of triangles which can be drawn using the lattice points in an n X n grid for vertices.

Terms

    a(0) =0a(1) =1a(2) =6a(3) =20a(4) =55a(5) =119a(6) =229a(7) =402a(8) =667a(9) =1019a(10) =1536a(11) =2216a(12) =3049a(13) =4168a(14) =5546a(15) =7203a(16) =9278a(17) =11755a(18) =14597a(19) =18054a(20) =22138a(21) =26625a(22) =31958a(23) =38120a(24) =44821a(25) =52764a(26) =61663a(27) =71204a(28) =82250a(29) =94479

External references