I took the index on the words, converted the amount to binary, included three zeros, calculated the sha256 digest, took the initial Portion of the hexadecimal to transform it to binary, added three zeros for the 8 digits of your binary and got 00000010011 which interprets to 19 in decimal. https://bookmarkpath.com/story18915314/the-5-second-trick-for-ledger-seed-phrase-bip39