A028492 Similarity classes of triangles which can be drawn using the lattice points in an n X n grid for vertices.

0, 1, 6, 20, 55, 119, 229, 402, 667, 1019, 1536, 2216, 3049, 4168, 5546, 7203, 9278, 11755, 14597, 18054, 22138, 26625, 31958, 38120, 44821, 52764, 61663, 71204, 82250, 94479, 107680, 122740, 139224, 156699, 176450, 198176, 220883

Offset: 0

Author

David J. Rusin

Keywords

• nonn

Links

• Sean A. Irvine, Java program (github)
• D. Rusin, Lattice Problem (Triangles) [Broken link]
• D. Rusin, Lattice Problem (Triangles) [Cached copy]

Crossrefs

Cf. A028419.

Extensions

Extended by Ray Chandler, May 03 2011