I took the index of the words, converted the number to binary, included 3 zeros, calculated the sha256 digest, took the primary Component of the hexadecimal to transform it to binary, added three zeros to your eight digits from the binary and bought 00000010011 which interprets to 19 in decimal. https://listingbookmarks.com/story18863780/getting-my-bip39-words-to-numbers-to-work