3047993domain: NAppears in sequencesPositive numbers y such that y^2 is of the form x^2+(x+577)^2 with integer x.at n=15A159626Number of nX4 0..1 arrays with every element equal to 0, 2, 4, 5 or 7 king-move adjacent elements, with upper left element zero.at n=17A298571