99342

Appears in sequences

• Expansion of Product_{n>=1} (1 - x^(3*n))/(1 - x^n)^3 in powers of x.at n=18A273845
• 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 edges in the resulting planar graph.at n=13A366485