I took the index with the words, converted the amount to binary, added three zeros, calculated the sha256 digest, took the main A part of the hexadecimal to transform it to binary, additional a few zeros to the 8 digits from the binary and received 00000010011 which translates to 19 https://wavesocialmedia.com/story4398907/the-ultimate-guide-to-bip39-seed-phrase-mnemonics-generator