I took the index on the words, transformed the range to binary, included 3 zeros, calculated the sha256 digest, took the primary Component of the hexadecimal to transform it to binary, extra 3 zeros on the eight digits with the binary and obtained 00000010011 which interprets to 19 in decimal. https://yesbookmarks.com/story19049176/a-secret-weapon-for-bip39-words-to-numbers