I took the index from the words, converted the quantity to binary, added three zeros, calculated the sha256 digest, took the first Portion of the hexadecimal to convert it to binary, added three zeros to your eight digits with the binary and obtained 00000010011 which interprets to 19 in decimal. https://webookmarks.com/story4481595/not-known-factual-statements-about-bip39-explained