I took the index with the words, converted the amount to binary, additional a few zeros, calculated the sha256 digest, took the main Section of the hexadecimal to transform it to binary, added a few zeros to your eight digits with the binary and bought 00000010011 which interprets to 19 https://lingeriebookmark.com/story8635741/getting-my-bip39-words-to-numbers-to-work