a(n) = (9*n)!*n!/((5*n)!*(3*n)!*(2*n)!).A295441a(n) = (9*n)!*n!/((5*n)!*(3*n)!*(2*n)!).Terms a(0) =1a(1) =252a(2) =204204a(3) =191222460a(4) =190004674860External referencesoeis: A295441