Number of scalene triangles whose vertices are the vertices of a regular n-gon.

Terms

a(0) =0a(1) =0a(2) =0a(3) =12a(4) =14a(5) =32a(6) =54a(7) =80a(8) =110a(9) =168a(10) =208a(11) =280a(12) =360a(13) =448a(14) =544a(15) =684a(16) =798a(17) =960a(18) =1134a(19) =1320a(20) =1518a(21) =1776a(22) =2000a(23) =2288a(24) =2592a(25) =2912a(26) =3248a(27) =3660a(28) =4030a(29) =4480