Number of n X 2 0..2 arrays with values 0..2 introduced in row major order and each element equal to no more than two horizontal and vertical neighbors.
A199649
Number of n X 2 0..2 arrays with values 0..2 introduced in row major order and each element equal to no more than two horizontal and vertical neighbors.
Terms
- a(0) =2a(1) =14a(2) =113a(3) =953a(4) =8037a(5) =67774a(6) =571530a(7) =4819638a(8) =40643380a(9) =342740340a(10) =2890284724a(11) =24373395288a(12) =205537673480
External references
- oeis: A199649