I took the index on the words, transformed the amount to binary, included three zeros, calculated the sha256 digest, took the initial Element of the hexadecimal to convert it to binary, extra three zeros to the eight digits on the binary and got 00000010011 which translates to 19 in decimal. https://bookmarkforest.com/story18780892/getting-my-bip39-words-to-numbers-to-work