196507

Appears in sequences

• Place n points on each of the three sides of a triangle, 3n points in all; a(n) = number of nondegenerate triangles that can be constructed using these points (plus the 3 original vertices) as vertices.at n=35A130748
• G.f. A(x) satisfies: A(x) = 1 + x * A(x/(1 - x)) / (1 - x^2).at n=11A346771