I took the index on the words, converted the amount to binary, added three zeros, calculated the sha256 digest, took the 1st Section of the hexadecimal to transform it to binary, additional a few zeros for the 8 digits in the binary and got 00000010011 which interprets to 19 in https://mysitesname.com/story8618920/facts-about-bip39-seed-phrase-word-list-revealed