Number of length-n 0..2 arrays with no repeated value differing from the previous repeated value by other than one.

A269531

Number of length-n 0..2 arrays with no repeated value differing from the previous repeated value by other than one.

Terms

    a(0) =3a(1) =9a(2) =24a(3) =64a(4) =164a(5) =418a(6) =1048a(7) =2614a(8) =6468a(9) =15942a(10) =39120a(11) =95734a(12) =233660a(13) =569230a(14) =1384408a(15) =3362686a(16) =8158932a(17) =19778982a(18) =47913504a(19) =115999462a(20) =280698860a(21) =678970558a(22) =1641785704a(23) =3968834446a(24) =9592037508a(25) =23178077334a(26) =55998523824a(27) =135275792374

External references