Number of non-well-founded sets or hypersets (sets that can contain themselves) of level n (representable by graphs with n nodes).

A027607

Number of non-well-founded sets or hypersets (sets that can contain themselves) of level n (representable by graphs with n nodes).

Terms

    a(0) =2a(1) =2a(2) =16a(3) =504a(4) =52944a(5) =17294924a(6) =17347940328

External references