I took the index of the words, converted the amount to binary, added three zeros, calculated the sha256 digest, took the first A part of the hexadecimal to convert it to binary, additional 3 zeros on the 8 digits of the binary and obtained 00000010011 which interprets to 19 in https://sociallweb.com/story4603852/top-guidelines-of-bip39-word-list-pdf