I took the index from the words, transformed the selection to binary, additional 3 zeros, calculated the sha256 digest, took the primary Component of the hexadecimal to transform it to binary, extra 3 zeros to your 8 digits of the binary and obtained 00000010011 which translates to 19 in decimal. https://zbookmarkhub.com/story19279873/the-ultimate-guide-to-bip39-seed-phrase-mnemonics-generator