748832256domain: NAppears in sequencesCoefficients of 1/sqrt(1-12*x+4*x^2); also, a(n) is the central coefficient of (1+6*x+8*x^2)^n.at n=9A084773a(n) = 8^n * P(3*n, n), where P(n, x) is n-th Legendre polynomial.at n=3A349113