I took the index with the words, transformed the number to binary, added three zeros, calculated the sha256 digest, took the 1st Component of the hexadecimal to transform it to binary, included a few zeros to your eight digits of the binary and bought 00000010011 which interprets to 19 in https://socialrator.com/story9427413/a-secret-weapon-for-bip39-words-to-numbers