I took the index from the words, converted the range to binary, added three zeros, calculated the sha256 digest, took the 1st Component 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://bookmarkfly.com/story19489636/new-step-by-step-map-for-ledger-seed-phrase-bip39