Number of n X 2 0..n+2-2 arrays with upper left zero and lower right n+2-2 and each element differing from its diagonal and antidiagonal neighbors by one or two.
A265474
Number of n X 2 0..n+2-2 arrays with upper left zero and lower right n+2-2 and each element differing from its diagonal and antidiagonal neighbors by one or two.
Terms
- a(0) =1a(1) =6a(2) =36a(3) =366a(4) =4900a(5) =55800a(6) =970225a(7) =11095448a(8) =204833344a(9) =1934752250a(10) =44951208289a(11) =364393934784
External references
- oeis: A265474