62868

Appears in sequences

• Number of regions in an equilateral triangular figure formed by the straight line segments connecting all vertices and all points that divide the sides into n equal parts.at n=13A092867
• a(n) = (2*n^3 + 5*n^2 - 13*n)/2.at n=38A162262
• Number of triple-crossings of diagonals in the regular 2n-gon.at n=34A260417
• Indices k such that s_k(4) is a (probable) prime, where s_k(4) = 4*s_{k-1}(4) - s_{k-2}(4), k >= 2, s_0(4) = 1, s_1(4) = 5.at n=22A299100
• Number of curved edges among all distinct circles that can be constructed from the 3 vertices and the equally spaced 3*n points placed on the sides of an equilateral triangle when every pair of the 3 + 3*n points are connected by a circle and where the points lie at the ends of the circle's diameter.at n=7A372733