I took the index with the words, transformed the range to binary, included three zeros, calculated the sha256 digest, took the initial A part of the hexadecimal to convert it to binary, added three zeros into the eight digits with the binary and received 00000010011 which translates to 19 in https://socialevity.com/story20618455/the-ultimate-guide-to-bip39-seed-phrase-mnemonics-generator