K0 k1 k2 calculation (Video2 Slide10)

Hello, it might be a nerd question.
But may I ask for an intuitive way to calculate k0 k1 k2 by hand between different relatives with different relatedness?
Or maybe a recommendation of the reference of any textbook/tutorial file.

Thank you!

I haven’t ever looked for a formula. I’ve just looked up tables when I wanted to know what we expect. Sorry to not be more helpful.