I took the index of your words, converted the range to binary, added 3 zeros, calculated the sha256 digest, took the very first Component of the hexadecimal to transform it to binary, included three zeros to your 8 digits on the binary and got 00000010011 which translates to 19 in https://iwanttobookmark.com/story19588669/ledger-seed-phrase-bip39-no-further-a-mystery