I took the index from the words, transformed the quantity to binary, included three zeros, calculated the sha256 digest, took the 1st A part of the hexadecimal to convert it to binary, additional a few zeros for the 8 digits with the binary and got 00000010011 which translates to 19 https://captainbookmark.com/story18984384/the-ultimate-guide-to-bip39-seed-phrase-mnemonics-generator