Examples of a quartically hyponormal weighted shift which is not 3-hyponormal are discussed in this note. In [7] Exner-Jung-Park proved that if α(x) : [수식] with 0 < x ≤ [수식], then W_(α(x)) is quartically hyponormal but not 4-hyponormal. And, Curto-Lee([5]) improved their result such as that if α(x) : [수식] with 0 < x ≤ [수식] then W_(α(x)) is quartically hyponormal but not 3-hyponormal. In this note, we improve slightly Curto-Lee's extremal value by using an algorithm and computer software tool.