I took the index with the words, transformed the variety to binary, extra three zeros, calculated the sha256 digest, took the 1st Element of the hexadecimal to transform it to binary, extra 3 zeros towards the eight digits of your binary and acquired 00000010011 which interprets to 19 in decimal. https://ok-social.com/story4400645/how-much-you-need-to-expect-you-ll-pay-for-a-good-bip39-definition