124623domain: NAppears in sequencesNonnegative values x of solutions (x, y) to the Diophantine equation x^2+(x+313)^2 = y^2.at n=11A129640Number of n X 4 0..1 arrays avoiding 0 0 0 and 1 0 1 horizontally and 0 0 1 and 1 0 1 vertically.at n=23A207165