a(n) = (10*n)!*(n/2)!/((5*n)!*(7*n/2)!*(2*n)!).A364180a(n) = (10*n)!*(n/2)!/((5*n)!*(7*n/2)!*(2*n)!).Terms a(0) =1a(1) =1152a(2) =5542680a(3) =31473008640External referencesoeis: A364180