I took the index of the words, converted the variety to binary, extra 3 zeros, calculated the sha256 digest, took the main Section of the hexadecimal to convert it to binary, included three zeros towards the 8 digits of your binary and received 00000010011 which interprets to 19 in decimal. https://ledbookmark.com/story4676707/little-known-facts-about-bip39-seed-phrase-list