Number of length-n 0..3 arrays with every repeated value unequal to the previous repeated value plus one mod 3+1.

A269771

Number of length-n 0..3 arrays with every repeated value unequal to the previous repeated value plus one mod 3+1.

Terms

    a(0) =4a(1) =16a(2) =64a(3) =252a(4) =984a(5) =3816a(6) =14724a(7) =56592a(8) =216864a(9) =829116a(10) =3164184a(11) =12058632a(12) =45904644a(13) =174598416a(14) =663634944a(15) =2521077372a(16) =9573268824a(17) =36340434216a(18) =137913296004a(19) =523277751312

External references