Almost-convex polygons of perimeter 2n on square lattice.
A007220
Almost-convex polygons of perimeter 2n on square lattice.
Terms
- a(0) =4a(1) =60a(2) =588a(3) =4636a(4) =31932a(5) =200364a(6) =1174492a(7) =6538492a(8) =34965772a(9) =181084796a(10) =913687100a(11) =4511834156a(12) =21880671292a(13) =104497300828a(14) =492527133804
External references
- oeis: A007220