Number of functions f:{1,2,...,n}->{1,2,...,n} such that Im(f) contains 3 fixed elements.

A126779

Number of functions f:{1,2,...,n}->{1,2,...,n} such that Im(f) contains 3 fixed elements.

Terms

    a(0) =6a(1) =60a(2) =750a(3) =11340a(4) =201726a(5) =4131036a(6) =95750430a(7) =2478397020a(8) =70864914846

External references