18378371domain: NAppears in sequencesa(n) = 3*a(n-1) + a(n-2) with a(0) = 2, a(1) = 3.at n=14A006497Numerators of continued fraction convergents to sqrt(13).at n=23A041018Numerators of continued fraction convergents to sqrt(117).at n=13A041212A Chebyshev or generalized Fibonacci sequence.at n=7A057076