Digital Design Principles and Practices 4th edition Problem 4.44:How many different nontrivial logic

Digital Design Principles and Practices 4th edition
Problem 4.44:How many different nontrivial logic functions are there ofn variables? Here, “nontrivial” means that all of thevariables affect the output.I understand that we are looking at Karnaugh maps of variousfunctions differing in n, where the number of squares inthe grid is 2n. I don'tunderstand how to figure out thenumber of nontrivial logic functions in each map.Couldsomeone give an example or two–such as for n3orn4?Any help is appreciated.Thankyou.