Number of nX3 0..4 arrays with each element x equal to the number its horizontal and vertical neighbors equal to 3,0,2,1,4 for x=0,1,2,3,4.

A196480

Number of nX3 0..4 arrays with each element x equal to the number its horizontal and vertical neighbors equal to 3,0,2,1,4 for x=0,1,2,3,4.

Terms

    a(0) =4a(1) =14a(2) =40a(3) =147a(4) =457a(5) =1554a(6) =5370a(7) =17678a(8) =58836a(9) =199055a(10) =666719a(11) =2226571a(12) =7472355a(13) =25062544a(14) =83919602a(15) =281223942a(16) =942759343a(17) =3159073709a(18) =10585785571a(19) =35477873281a(20) =118895583561a(21) =398433388350

External references