Number of scalene triangles, distinct up to congruence, on an n X n grid (or geoboard).

Terms

a(0) =0a(1) =0a(2) =3a(3) =18a(4) =57a(5) =137a(6) =280a(7) =517a(8) =863a(9) =1368a(10) =2069a(11) =3007a(12) =4218a(13) =5774a(14) =7704a(15) =10109a(16) =13025a(17) =16523a(18) =20671a(19) =25567a(20) =31274a(21) =37891a(22) =45529a(23) =54213a(24) =64082a(25) =75320a(26) =87901a(27) =102014a(28) =117736a(29) =135217