a(n) = n!*(n+5)!/5!.A010794a(n) = n!*(n+5)!/5!.Terms a(0) =1a(1) =6a(2) =84a(3) =2016a(4) =72576a(5) =3628800a(6) =239500800a(7) =20118067200External referencesoeis: A010794