415988domain: NAppears in sequencesNumber of regions formed in a square by straight line segments when connecting the n+1 points along each edge that divide it into n equal parts to the n+1 points on the edge on the opposite side of the square.at n=22A355838Expansion of 1/( (1 + x)^2 * (1 - x^2*(1 + x)^2) ).at n=31A375373