894997357851domain: NAppears in sequencesNumerators of continued fraction convergents to sqrt(53).at n=23A041090a(n) = 7*a(n-1) + a(n-2), starting with a(0) = 2 and a(1) = 7.at n=14A086902Twice Chebyshev polynomials of the first kind, T(n,x), evaluated at x=51/2.at n=7A099368