108768domain: NAppears in sequencesa(n) = 3*n^3 + n^2 - 4*n.at n=33A083127Number of regions in a polygon whose boundary consists of n+2 equally spaced points around a semicircle and n+2 equally spaced points along the diameter (a total of 2n+2 points). See Comments for precise definition.at n=22A333519