I took the index from the words, transformed the range to binary, added 3 zeros, calculated the sha256 digest, took the primary part of the hexadecimal to transform it to binary, included three zeros to your 8 digits on the binary and acquired 00000010011 which interprets to 19 in decimal. https://nowbookmarks.com/story19504977/new-step-by-step-map-for-ledger-seed-phrase-bip39