523831

Appears in sequences

• a(n) = Sum_{k=0..n} C(n-k, floor(k/2))*2^k.at n=19A097334
• One-fourth of the total number of edges in the graph (see A392172) formed when n points are placed in general position on each edge of a square and a chord is drawn from each point to the 3*n points on the other three sides.at n=19A392174