I took the index on the words, converted the amount to binary, additional 3 zeros, calculated the sha256 digest, took the 1st Component of the hexadecimal to transform it to binary, extra 3 zeros on the 8 digits of the binary and got 00000010011 which interprets to 19 in decimal. https://maximusbookmarks.com/story19094676/5-essential-elements-for-bip39-explained