I took the index of the words, transformed the quantity to binary, extra 3 zeros, calculated the sha256 digest, took the main A part of the hexadecimal to convert it to binary, additional three zeros to the 8 digits in the binary and received 00000010011 which translates to 19 in https://thegreatbookmark.com/story18864489/new-step-by-step-map-for-ledger-seed-phrase-bip39