a(n) = (12*n)!*(2*n)!/((7*n)!*(4*n)!*(3*n)!).A295449a(n) = (12*n)!*(2*n)!/((7*n)!*(4*n)!*(3*n)!).Terms a(0) =1a(1) =1320a(2) =5883768a(3) =30159472200External referencesoeis: A295449