10347508061domain: NAppears in sequencesa(1) = 11, a(2) = 19, a(3) = 89, a(4) = 151; for n >= 5, a(n) = sqrt(a(n-4)^2 + 60*a(n-2)^2 + 4*a(n-2)*sqrt(210 + 15*a(n-4)^2)).at n=20A103201y-values in the solution to 15*x^2 - 14 = y^2.at n=21A199338