I took the index with the words, transformed the quantity to binary, additional 3 zeros, calculated the sha256 digest, took the main Portion of the hexadecimal to transform it to binary, included 3 zeros towards the 8 digits of your binary and received 00000010011 which translates to 19 in decimal. https://socialexpresions.com/story4462412/new-step-by-step-map-for-ledger-seed-phrase-bip39