Number of self-avoiding polygons of area n with 2 (self-avoiding polygon) holes on square lattice (not allowing rotations).

A057407

Number of self-avoiding polygons of area n with 2 (self-avoiding polygon) holes on square lattice (not allowing rotations).

Terms

    a(0) =2a(1) =36a(2) =366a(3) =2832a(4) =18666a(5) =110724a(6) =609922a(7) =3182038a(8) =15931446a(9) =77253554a(10) =365240626a(11) =1691895678a(12) =7707586246a(13) =34630458076a(14) =153803559514a(15) =676416563354

External references