I took the index with the words, transformed the variety to binary, extra 3 zeros, calculated the sha256 digest, took the main Element of the hexadecimal to convert it to binary, included three zeros to your 8 digits in the binary and bought 00000010011 which interprets to 19 in decimal. https://getsocialnetwork.com/story4976610/the-greatest-guide-to-seed-phrase-bip39