I took the index in the words, converted the amount to binary, additional three zeros, calculated the sha256 digest, took the primary Component of the hexadecimal to convert it to binary, included three zeros on the eight digits from the binary and obtained 00000010011 which translates to 19 in decimal. https://thekiwisocial.com/story4315527/getting-my-bip39-words-to-numbers-to-work