Number of n X 2 0..4 arrays with each element x equal to the number its horizontal and vertical neighbors equal to 2,1,1,0,0 for x=0,1,2,3,4.
A197444
Number of n X 2 0..4 arrays with each element x equal to the number its horizontal and vertical neighbors equal to 2,1,1,0,0 for x=0,1,2,3,4.
Terms
- a(0) =2a(1) =5a(2) =12a(3) =36a(4) =107a(5) =321a(6) =957a(7) =2868a(8) =8581a(9) =25694a(10) =76914a(11) =230273a(12) =689377a(13) =2063867a(14) =6178778a(15) =18498023a(16) =55379290a(17) =165794354a(18) =496354537a(19) =1485984549a(20) =4448735449a(21) =13318609060a(22) =39873206463a(23) =119372269782a(24) =357376295102
External references
- oeis: A197444