I took the index on the words, converted the quantity to binary, additional 3 zeros, calculated the sha256 digest, took the main Section of the hexadecimal to transform it to binary, included 3 zeros for the 8 digits of the binary and got 00000010011 which translates to 19 in decimal. https://bookmarktune.com/story19514181/new-step-by-step-map-for-ledger-seed-phrase-bip39