I took the index of your words, converted the amount to binary, extra 3 zeros, calculated the sha256 digest, took the 1st Element of the hexadecimal to transform it to binary, extra 3 zeros to the 8 digits of your binary and acquired 00000010011 which translates to 19 in decimal. https://bookmarkmiracle.com/story20321560/detailed-notes-on-copyright-wallet-seed-phrase-out-of-bip39