Number of distinct connected planar figures that can be formed from n 1x2 rectangles (or dominoes) such that each pair of touching rectangles shares exactly one edge, of length 1, and the adjacency graph of the rectangles is a tree.
A216581
Number of distinct connected planar figures that can be formed from n 1x2 rectangles (or dominoes) such that each pair of touching rectangles shares exactly one edge, of length 1, and the adjacency graph of the rectangles is a tree.
Terms
- a(0) =1a(1) =2a(2) =14a(3) =114a(4) =1038a(5) =10042a(6) =101046a(7) =1044712a(8) =11018478a(9) =117996288a(10) =1278942418a(11) =13998440610a(12) =154462050186
External references
- oeis: A216581