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

A269488

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

Terms

    a(0) =3a(1) =9a(2) =27a(3) =77a(4) =215a(5) =591a(6) =1609a(7) =4353a(8) =11731a(9) =31543a(10) =84721a(11) =227481a(12) =610947a(13) =1641823a(14) =4415873a(15) =11888737a(16) =32041667a(17) =86449895a(18) =233495441a(19) =631307785a(20) =1708559779a(21) =4628272463a(22) =12548119617a(23) =34047086033a(24) =92447178723a(25) =251183783319

External references