I took the index of your words, converted the quantity to binary, additional 3 zeros, calculated the sha256 digest, took the initial Component of the hexadecimal to convert it to binary, extra 3 zeros to the eight digits from the binary and obtained 00000010011 which interprets to 19 in decimal. https://socialbuzztoday.com/story4437324/the-ultimate-guide-to-bip39-seed-phrase-github