The number of functions f:{1,2,...,n}->{1,2,...,n}, endofunctions, such that exactly one nonrecurrent element is mapped into each recurrent element.

A215720

The number of functions f:{1,2,...,n}->{1,2,...,n}, endofunctions, such that exactly one nonrecurrent element is mapped into each recurrent element.

Terms

    a(0) =1a(1) =0a(2) =2a(3) =6a(4) =60a(5) =560a(6) =7350a(7) =111552a(8) =2009672a(9) =41378976a(10) =963527850a(11) =25009038560a(12) =716437784172

External references