I took the index from the words, converted the range to binary, added a few zeros, calculated the sha256 digest, took the initial Element of the hexadecimal to transform it to binary, added 3 zeros to the 8 digits of your binary and received 00000010011 which interprets to 19 in https://socialbookmarkgs.com/story19516674/the-definitive-guide-to-bip39-seed-phrase