607384

Appears in sequences

• Place a point on the integer coordinates, up to |n|, along all four axial directions on a Cartesian plane, and then join an infinite straight line between every pair of points: a(n) is the number of finite edges created in the resulting graph.at n=14A386561
• E.g.f. A(x) satisfies A(x) = exp( x/(1-x^3)^3 * A(x) ).at n=7A390185