I took the index of your words, transformed the amount to binary, included 3 zeros, calculated the sha256 digest, took the main Component of the hexadecimal to convert it to binary, extra three zeros for the eight digits of the binary and acquired 00000010011 which interprets to 19 in decimal. https://bookmarksden.com/story19022475/getting-my-bip39-words-to-numbers-to-work