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 antidiagonal neighbors by one or two.
A265460
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 antidiagonal neighbors by one or two.
Terms
- a(0) =1a(1) =3a(2) =18a(3) =232a(4) =2764a(5) =34471a(6) =448920a(7) =5975090a(8) =80447900a(9) =1094426175a(10) =14999904834a(11) =206767086652
External references
- oeis: A265460