I took the index with the words, converted the selection to binary, additional 3 zeros, calculated the sha256 digest, took the first part of the hexadecimal to transform it to binary, added 3 zeros into the 8 digits on the binary and acquired 00000010011 which translates to 19 in decimal. https://bookmark-group.com/story4616336/helping-the-others-realize-the-advantages-of-bip39-seed-phrase-mnemonics-generator