a(n) = (15*n)!*(4*n)!/((8*n)!*(6*n)!*(5*n)!).A295457a(n) = (15*n)!*(4*n)!/((8*n)!*(6*n)!*(5*n)!).Terms a(0) =1a(1) =9009a(2) =294076965External referencesoeis: A295457