I took the index with the words, converted the range to binary, added three zeros, calculated the sha256 digest, took the very first Element of the hexadecimal to convert it to binary, added three zeros to your eight digits from the binary and received 00000010011 which translates to 19 in https://blogfreely.net/travenmdoq/h1-b-bip39-word-listing-explained-your-important-source-for-creating-secure