I took the index from the words, converted the quantity to binary, added three zeros, calculated the sha256 digest, took the very first A part of the hexadecimal to convert it to binary, added three zeros towards the 8 digits in the binary and received 00000010011 which translates to 19 https://rotatesites.com/story20043397/a-secret-weapon-for-bip39-words-to-numbers