Number of connected functions from {1,2,...,n} into a subset of {1,2,...,n} that have a fixed point summed over all subsets.

A216857

Number of connected functions from {1,2,...,n} into a subset of {1,2,...,n} that have a fixed point summed over all subsets.

Terms

    a(0) =0a(1) =1a(2) =4a(3) =24a(4) =224a(5) =2880a(6) =47232a(7) =942592a(8) =22171648a(9) =600698880a(10) =18422374400a(11) =630897721344

External references