The number of ways to tile (with squares and rectangles) a 2 X (n+2) strip with the upper left and upper right squares removed.
A316726
The number of ways to tile (with squares and rectangles) a 2 X (n+2) strip with the upper left and upper right squares removed.
Terms
- a(0) =2a(1) =4a(2) =15a(3) =46a(4) =150a(5) =480a(6) =1545a(7) =4964a(8) =15958a(9) =51292a(10) =164871a(11) =529946a(12) =1703418a(13) =5475328a(14) =17599457a(15) =56570280a(16) =181834970a(17) =584475732a(18) =1878691887a(19) =6038716422a(20) =19410365422a(21) =62391120800a(22) =200545011401a(23) =644615789580
External references
- oeis: A316726