318365domain: NAppears in sequencesLucas sequence U(5,-8): a(n+1) = 5*a(n) + 8*a(n-1), a(0)=0, a(1)=1.at n=8A015544Denominators of continued fraction convergents to sqrt(34).at n=12A041057Hypotenuses of primitive Pythagorean triples in A195577 and A195578.at n=8A195579Markoff spectrum N^(2)(Lambda).at n=19A293174