Number of hexagonal polyominoes (or polyhexes, A000228) with perimeter 2n.
A057779
Number of hexagonal polyominoes (or polyhexes, A000228) with perimeter 2n.
Terms
- a(0) =0a(1) =0a(2) =1a(3) =0a(4) =1a(5) =1a(6) =3a(7) =2a(8) =12a(9) =14a(10) =50a(11) =98a(12) =313a(13) =750a(14) =2308a(15) =6270
External references
- oeis: A057779