Number of acute isosceles triangles on a centered hexagonal grid of size n.

A241229

Number of acute isosceles triangles on a centered hexagonal grid of size n.

Terms

    a(0) =0a(1) =8a(2) =144a(3) =768a(4) =2558a(5) =6564a(6) =14334a(7) =27626a(8) =48828a(9) =80772a(10) =126692a(11) =190230a(12) =275700a(13) =388016a(14) =532386a(15) =714906a(16) =941600a(17) =1219410a(18) =1556184a(19) =1959608a(20) =2438868a(21) =3002700

External references