One quarter the number of n X 5 1..4 arrays with no two neighbors of any element equal to each other.

A183357

One quarter the number of n X 5 1..4 arrays with no two neighbors of any element equal to each other.

Terms

    a(0) =108a(1) =2304a(2) =3888a(3) =9216a(4) =24192a(5) =57600a(6) =137088a(7) =331776a(8) =802944a(9) =1937664a(10) =4675968a(11) =11289600a(12) =27257472a(13) =65804544a(14) =158864256a(15) =383533056a(16) =925932672a(17) =2235398400a(18) =5396727168a(19) =13028852736a(20) =31454434944a(21) =75937722624a(22) =183329877888

External references