Number of staircase polygons of perimeter 2n with 2 (staircase polygon) holes on square lattice (not allowing rotations).
A057411
Number of staircase polygons of perimeter 2n with 2 (staircase polygon) holes on square lattice (not allowing rotations).
Terms
- a(0) =2a(1) =54a(2) =737a(3) =7330a(4) =60362a(5) =438284a(6) =2908069a(7) =18032906a(8) =106088843a(9) =598428100a(10) =3261717223a(11) =17278076588a(12) =89351738840a(13) =452686823796
External references
- oeis: A057411