332820602355domain: NAppears in sequencesPositive integer values of k such that 10*k^2 - 9 is a square.at n=22A052454a(n) = 6*a(n-2) + a(n-4), where a(0) = 3, a(1) = 11, a(2) = 18, a(3) = 68.at n=28A228470