There are 26 digits in the sequence. The title hints that the English and French languages play a role.
Each digit refers to a letter of the alphabet. In particular it represents the number of syllables in the pronunciation of that letter of the alphabet.
In English, the only letter with more than one syllable in its pronounced name is W, making x = 3 and y = 1.
In French, Y also has more than one syllable, so in French x = 3 and y = 2.