Number of length-n 0..3 arrays with no following elements greater than or equal to the first repeated value.

A267227

Number of length-n 0..3 arrays with no following elements greater than or equal to the first repeated value.

Terms

    a(0) =4a(1) =16a(2) =54a(3) =176a(4) =564a(5) =1790a(6) =5646a(7) =17732a(8) =55512a(9) =173354a(10) =540258a(11) =1680848a(12) =5221740a(13) =16200758a(14) =50204790a(15) =155413724a(16) =480622848a(17) =1484980802a(18) =4584213642a(19) =14140323560a(20) =43583756436a(21) =134239102286a(22) =413179757214

External references