I took the index on the words, transformed the range to binary, included three zeros, calculated the sha256 digest, took the initial Portion of the hexadecimal to convert it to binary, added three zeros to the eight digits of the binary and received 00000010011 which interprets to 19 in decimal. https://thefairlist.com/story9716449/facts-about-bip39-seed-phrase-word-list-revealed