Number of n X 2 0..2 arrays avoiding the patterns z z+1 z or z z-1 z in any row or column.
A207009
Number of n X 2 0..2 arrays avoiding the patterns z z+1 z or z z-1 z in any row or column.
Terms
- a(0) =9a(1) =81a(2) =529a(3) =3721a(4) =25921a(5) =180625a(6) =1256641a(7) =8743849a(8) =60855601a(9) =423577561a(10) =2948164209a(11) =20519130025a(12) =142812189025a(13) =993971114361
External references
- oeis: A207009