Number of functions f:{1,2,...,n}->{1,2,...,n} such that Im(f) contains 6 fixed elements.
A126781
Number of functions f:{1,2,...,n}->{1,2,...,n} such that Im(f) contains 6 fixed elements.
Terms
- a(0) =720a(1) =20160a(2) =514080a(3) =13608000a(4) =385363440a(5) =11760819840a(6) =386860668480
External references
- oeis: A126781