Number of nX4 0..1 arrays with every element equal to 2, 3, 5, 6 or 8 king-move adjacent elements, with upper left element zero.

A298891

Number of nX4 0..1 arrays with every element equal to 2, 3, 5, 6 or 8 king-move adjacent elements, with upper left element zero.

Terms

    a(0) =0a(1) =2a(2) =4a(3) =11a(4) =31a(5) =80a(6) =229a(7) =681a(8) =1969a(9) =5973a(10) =18031a(11) =54874a(12) =167752a(13) =513625a(14) =1575095a(15) =4835994a(16) =14859480a(17) =45674676a(18) =140452387a(19) =431987865a(20) =1328865560a(21) =4088283165a(22) =12578581331a(23) =38703117525a(24) =119090222855a(25) =366452309799

External references