Number of length-n 0..3 arrays with no repeated value unequal to the previous repeated value plus one mod 3+1.

A268939

Number of length-n 0..3 arrays with no repeated value unequal to the previous repeated value plus one mod 3+1.

Terms

    a(0) =4a(1) =16a(2) =60a(3) =220a(4) =788a(5) =2780a(6) =9684a(7) =33404a(8) =114292a(9) =388444a(10) =1312788a(11) =4415548a(12) =14790836a(13) =49369628a(14) =164279892a(15) =545170172a(16) =1804855540a(17) =5962578652a(18) =19661140116a(19) =64722276796a(20) =212738159924a(21) =698312564636

External references