I took the index of the words, converted the range to binary, additional 3 zeros, calculated the sha256 digest, took the initial Element of the hexadecimal to transform it to binary, added 3 zeros to your 8 digits in the binary and acquired 00000010011 which interprets to 19 in decimal. https://bookmarkplaces.com/story18790782/a-secret-weapon-for-bip39-words-to-numbers