I took the index on the words, converted the amount to binary, included 3 zeros, calculated the sha256 digest, took the 1st Section of the hexadecimal to transform it to binary, extra three zeros for the 8 digits of your binary and received 00000010011 which translates to 19 in decimal. https://johsocial.com/story9193869/the-ultimate-guide-to-bip39-seed-phrase-mnemonics-generator