Number of self-avoiding polygons of area n with one (self-avoiding polygon) hole on square lattice (not allowing rotations).

A057406

Number of self-avoiding polygons of area n with one (self-avoiding polygon) hole on square lattice (not allowing rotations).

Terms

    a(0) =1a(1) =12a(2) =88a(3) =524a(4) =2786a(5) =13788a(6) =64998a(7) =296032a(8) =1314648a(9) =5728172a(10) =24595512a(11) =104399172a(12) =439084884a(13) =1833027048a(14) =7605691356a(15) =31398503248a(16) =129072844079a(17) =528688519536

External references