Number of nX4 0..1 arrays with every element equal to 0, 1, 2 or 4 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.
A300494
Number of nX4 0..1 arrays with every element equal to 0, 1, 2 or 4 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.
Terms
- a(0) =8a(1) =50a(2) =143a(3) =499a(4) =1513a(5) =4686a(6) =14822a(7) =46717a(8) =149232a(9) =478952a(10) =1535689a(11) =4933050a(12) =15841261a(13) =50859780a(14) =163369287a(15) =524865720a(16) =1686760800a(17) =5422294854a(18) =17433648120a(19) =56061128928a(20) =180296581790a(21) =579900593771
External references
- oeis: A300494