I took the index of the words, converted the number to binary, added three zeros, calculated the sha256 digest, took the main Element of the hexadecimal to convert it to binary, additional three zeros on the eight digits from the binary and got 00000010011 which interprets to 19 in decimal. https://whitebookmarks.com/story18877663/a-secret-weapon-for-bip39-words-to-numbers