Number of nX2 0..n+2-2 arrays with upper left zero and lower right n+2-2 and each element differing from its horizontal and vertical neighbors by one or two.
A265441
Number of nX2 0..n+2-2 arrays with upper left zero and lower right n+2-2 and each element differing from its horizontal and vertical neighbors by one or two.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =53a(4) =455a(5) =2218a(6) =9702a(7) =59956a(8) =444998a(9) =2915881a(10) =16984838a(11) =100144150a(12) =638465320a(13) =4169033187a(14) =26450244798a(15) =164385366814
External references
- oeis: A265441