Number of free polyominoes (A000105) with perimeter 2n.
A057730
Number of free polyominoes (A000105) with perimeter 2n.
Terms
- a(0) =0a(1) =1a(2) =1a(3) =3a(4) =6a(5) =25a(6) =86a(7) =416a(8) =1988a(9) =10640a(10) =57987a(11) =328956a(12) =1900321a(13) =11204350a(14) =67042778a(15) =406780346
External references
- oeis: A057730