I took the index from the words, transformed the number to binary, extra three zeros, calculated the sha256 digest, took the main Component of the hexadecimal to transform it to binary, additional three zeros to the 8 digits on the binary and got 00000010011 which translates to 19 in decimal. https://bookmarkvids.com/story20152043/the-ultimate-guide-to-bip39-seed-phrase-mnemonics-generator