I took the index with the words, transformed the selection to binary, extra 3 zeros, calculated the sha256 digest, took the primary Portion of the hexadecimal to convert it to binary, extra 3 zeros on the 8 digits of your binary and got 00000010011 which translates to 19 in decimal. https://bookmarkcork.com/story19397973/a-review-of-bip39-phrase-list