I took the index from the words, transformed the number to binary, added three zeros, calculated the sha256 digest, took the primary Component of the hexadecimal to transform it to binary, added 3 zeros to your eight digits from the binary and obtained 00000010011 which translates to 19 in decimal. https://onlybookmarkings.com/story19395952/little-known-facts-about-bip39-words