a(n) = (A166351(n))^2 = ((6*n)!/((3*n)!))^2.A166371a(n) = (A166351(n))^2 = ((6*n)!/((3*n)!))^2.Terms a(0) =1a(1) =14400a(2) =442597478400External referencesoeis: A166371