1226567328domain: NAppears in sequencesa(n) = 4*a(n-1) - a(n-2), with a(0) = 0, a(1) = 3.at n=16A005320a(n) = 4*a(n-2) - a(n-4).at n=31A083336Numerators of the lower principal convergents and the lower intermediate convergents to 3^(1/2).at n=31A143643Numerators of the other-side convergents to sqrt(3).at n=31A259593