260219353691domain: NAppears in sequencesa(n) = 3*a(n-1) + a(n-2) with a(0) = 2, a(1) = 3.at n=22A006497Numerators of continued fraction convergents to sqrt(117).at n=21A041212A Chebyshev or generalized Fibonacci sequence.at n=11A057076a(n) = 2 * T(n,n/2) where T(n,x) is a Chebyshev polynomial of the first kind.at n=11A343259