17083879020domain: NAppears in sequencesa(n) = 4*a(n-1) - a(n-2), with a(0) = 0, a(1) = 3.at n=18A005320Numerators of continued fraction convergents to sqrt(147).at n=8A041268Numerators of the lower principal convergents and the lower intermediate convergents to 3^(1/2).at n=35A143643