I took the index of the words, converted the range to binary, included 3 zeros, calculated the sha256 digest, took the initial Component of the hexadecimal to convert it to binary, added 3 zeros to your 8 digits of your binary and received 00000010011 which interprets to 19 in decimal. https://crossbookmark.com/story18700497/facts-about-bip39-seed-phrase-word-list-revealed