I took the index on the words, transformed the quantity to binary, added three zeros, calculated the sha256 digest, took the very first A part of the hexadecimal to convert it to binary, extra 3 zeros for the eight digits with the binary and obtained 00000010011 which interprets to 19 https://onelifesocial.com/story4135508/the-ultimate-guide-to-bip39-seed-phrase-mnemonics-generator