I have referred to
China Mainland Online Dictionary
and Online Stroke Order Dictionary of Ministry of Education of Republic of China
Both are giving different numbers of stroke for this word. China Mainland: 18 Total Strokes. Republic of China: 16 Total Strokes.
But I counted myself, it is 17 strokes. 丨一 一丨乛 一 一丨丿丨丨乛丨一 乛 一丨