Number of functions f:{1,2,...,n}->{1,2,...,n} such that Im(f) contains 5 fixed elements.

A126232

Number of functions f:{1,2,...,n}->{1,2,...,n} such that Im(f) contains 5 fixed elements.

Terms

    a(0) =120a(1) =2520a(2) =52080a(3) =1164240a(4) =28594440a(5) =771309000a(6) =22746757440a(7) =729419296320

External references