I took the index of the words, transformed the number to binary, additional a few zeros, calculated the sha256 digest, took the primary Section of the hexadecimal to convert it to binary, included three zeros to your 8 digits with the binary and obtained 00000010011 which interprets to 19 in https://businessbookmark.com/story4425672/getting-my-bip39-words-to-numbers-to-work