Number of n X 2 0..3 arrays with every 0 next to a 1, every 1 next to a 2 and every 2 next to a 3 horizontally, diagonally or antidiagonally, and no adjacent values equal.

A232370

Number of n X 2 0..3 arrays with every 0 next to a 1, every 1 next to a 2 and every 2 next to a 3 horizontally, diagonally or antidiagonally, and no adjacent values equal.

Terms

    a(0) =2a(1) =14a(2) =58a(3) =230a(4) =934a(5) =3794a(6) =15354a(7) =62266a(8) =252346a(9) =1022806a(10) =4145638a(11) =16802922a(12) =68105158a(13) =276041834a(14) =1118844570a(15) =4534868126a(16) =18380594246a(17) =74499685134a(18) =301959937342

External references