I took the index of the words, transformed the quantity to binary, additional 3 zeros, calculated the sha256 digest, took the very first A part of the hexadecimal to convert it to binary, additional 3 zeros for the eight digits of your binary and acquired 00000010011 which translates to 19 https://worldlistpro.com/story20588111/getting-my-bip39-words-to-numbers-to-work