628855930domain: NAppears in sequencesa(n) = 20*a(n-1) - a(n-2).at n=7A001085Numerators of continued fraction convergents to sqrt(11).at n=13A041014Numerators of continued fraction convergents to sqrt(99).at n=13A04117864*n^7 - 112*n^5 + 56*n^3 - 7*n.at n=10A243133