I took the index in the words, converted the number to binary, extra three zeros, calculated the sha256 digest, took the 1st Portion of the hexadecimal to transform it to binary, additional 3 zeros to the eight digits on the binary and received 00000010011 which translates to 19 in decimal. https://bookmarkingalpha.com/story19477887/bip39-seed-phrase-fundamentals-explained