I took the index of your words, converted the variety to binary, extra three zeros, calculated the sha256 digest, took the initial Section of the hexadecimal to convert it to binary, added three zeros into the 8 digits with the binary and got 00000010011 which interprets to 19 in decimal. https://kingslists.com/story20049352/the-definitive-guide-to-bip39-seed-phrase