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

A197396

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

Terms

    a(0) =1a(1) =9a(2) =17a(3) =81a(4) =257a(5) =1003a(6) =3417a(7) =12673a(8) =46165a(9) =168569a(10) =614795a(11) =2245461a(12) =8191537a(13) =29913649a(14) =109228305a(15) =398768515a(16) =1455927145a(17) =5315748449a(18) =19407950069a(19) =70859924513a(20) =258716449075a(21) =944591935629

External references