I took the index with the words, converted the amount to binary, added 3 zeros, calculated the sha256 digest, took the main Portion of the hexadecimal to transform it to binary, additional 3 zeros on the eight digits on the binary and got 00000010011 which interprets to 19 in decimal. https://travialist.com/story9020460/facts-about-bip39-seed-phrase-github-revealed