Number of free polyominoes with 2n cells.
A210996
Number of free polyominoes with 2n cells.
Terms
- a(0) =1a(1) =1a(2) =5a(3) =35a(4) =369a(5) =4655a(6) =63600a(7) =901971a(8) =13079255a(9) =192622052a(10) =2870671950a(11) =43191857688a(12) =654999700403
External references
- oeis: A210996