I took the index with the words, converted the amount to binary, additional 3 zeros, calculated the sha256 digest, took the initial Component of the hexadecimal to convert it to binary, added a few zeros to your 8 digits of the binary and obtained 00000010011 which translates to 19 in https://mysocialname.com/story4113301/ledger-seed-phrase-bip39-no-further-a-mystery