正解があまり出ていないようなので、ヒントを出します。この数列は「英語」に関連する規則性を持っています。数学的に考えても答えは出てきませんよ！
I will provide the hint since it seems that there are only a few correct answers coming out. This number series has a regularity connection in "English". The answer won't come out if you think of it mathematically!
