I took the index in the words, transformed the quantity to binary, extra three zeros, calculated the sha256 digest, took the primary part of the hexadecimal to convert it to binary, included 3 zeros into the 8 digits with the binary and got 00000010011 which interprets to 19 in decimal. https://bookmark-share.com/story19080689/getting-my-bip39-words-to-numbers-to-work