a(n) = (15*n)!*(2*n)!/((10*n)!*(6*n)!*n!).A295462a(n) = (15*n)!*(2*n)!/((10*n)!*(6*n)!*n!).Terms a(0) =1a(1) =1001a(2) =2731365a(3) =8452632980External referencesoeis: A295462