Number of nX4 0..1 arrays with every element equal to 0, 1, 2 or 3 horizontally or vertically adjacent elements, with upper left element zero.
A301780
Number of nX4 0..1 arrays with every element equal to 0, 1, 2 or 3 horizontally or vertically adjacent elements, with upper left element zero.
Terms
- a(0) =8a(1) =128a(2) =1808a(3) =25872a(4) =369936a(5) =5289488a(6) =75632400a(7) =1081436176a(8) =15463010576a(9) =221099215376
External references
- oeis: A301780