I took the index of the words, transformed the selection to binary, included three zeros, calculated the sha256 digest, took the main part of the hexadecimal to convert it to binary, additional three zeros towards the 8 digits of the binary and received 00000010011 which translates to 19 in decimal. https://tetrabookmarks.com/story18835379/new-step-by-step-map-for-ledger-seed-phrase-bip39