I took the index in the words, transformed the quantity to binary, extra 3 zeros, calculated the sha256 digest, took the first part of the hexadecimal to convert it to binary, additional 3 zeros on the 8 digits from the binary and received 00000010011 which interprets to 19 in decimal. https://bookmarkinglife.com/story4485859/getting-my-bip39-words-to-numbers-to-work