I took the index on the words, transformed the number to binary, added 3 zeros, calculated the sha256 digest, took the initial Section of the hexadecimal to transform it to binary, extra 3 zeros into the eight digits of the binary and got 00000010011 which interprets to 19 in decimal. https://infopagex.com/story4268751/getting-my-bip39-words-to-numbers-to-work