I took the index in the words, transformed the selection to binary, added 3 zeros, calculated the sha256 digest, took the primary Portion of the hexadecimal to transform it to binary, included three zeros for the 8 digits of your binary and got 00000010011 which translates to 19 in decimal. https://businessbookmark.com/story4340407/new-step-by-step-map-for-ledger-seed-phrase-bip39