I took the index of your words, transformed the amount to binary, added 3 zeros, calculated the sha256 digest, took the primary Element of the hexadecimal to transform it to binary, additional 3 zeros into the 8 digits from the binary and acquired 00000010011 which interprets to 19 in decimal. https://myfirstbookmark.com/story18834721/new-step-by-step-map-for-bip39-english-words