I took the index with the words, transformed the amount to binary, extra 3 zeros, calculated the sha256 digest, took the first Portion of the hexadecimal to transform it to binary, included three zeros for the 8 digits with the binary and got 00000010011 which interprets to 19 in decimal. https://zenwriting.net/keenanctdp/h1-b-unlocking-the-power-of-bip39-a-comprehensive-look-at-word-lists-and