I took the index from the words, transformed the range to binary, included a few zeros, calculated the sha256 digest, took the primary Component of the hexadecimal to convert it to binary, extra 3 zeros to your eight digits on the binary and acquired 00000010011 which translates to 19 in https://hotbookmarkings.com/story18966320/new-step-by-step-map-for-ledger-seed-phrase-bip39