I took the index with the words, transformed the range to binary, added three zeros, calculated the sha256 digest, took the 1st A part of the hexadecimal to transform it to binary, added a few zeros towards the 8 digits of your binary and got 00000010011 which interprets to 19 https://letsbookmarkit.com/story18867748/examine-this-report-on-bip39-mnemonic-phrase-tool