I took the index with the words, converted the number to binary, extra three zeros, calculated the sha256 digest, took the primary Element of the hexadecimal to convert it to binary, additional 3 zeros to the eight digits of your binary and received 00000010011 which translates to 19 in decimal. https://fatallisto.com/story8712376/facts-about-bip39-seed-phrase-word-list-revealed