47154

Appears in sequences

• a(n) = Sum_{d|n} (n/d)^(n/d) * binomial(d+n-2,n-1).at n=5A343567
• Place n equally spaced points on each side of an equilateral triangle, and join each of these points by a chord to the 2*n new points on the other two sides: sequence gives number of interior vertices in the resulting planar graph.at n=13A366484