I took the index of your words, transformed the amount to binary, included a few zeros, calculated the sha256 digest, took the primary Portion of the hexadecimal to convert it to binary, included 3 zeros for the 8 digits from the binary and got 00000010011 which translates to 19 in https://bookmarkinglive.com/story19647814/the-2-minute-rule-for-bip39-all-words