Number of n X 1 0..3 arrays avoiding the patterns z z+1 z or z z-1 z in any row, column, diagonal or antidiagonal.
A207276
Number of n X 1 0..3 arrays avoiding the patterns z z+1 z or z z-1 z in any row, column, diagonal or antidiagonal.
Terms
- a(0) =4a(1) =16a(2) =58a(3) =214a(4) =788a(5) =2902a(6) =10686a(7) =39350a(8) =144902a(9) =533586a(10) =1964872a(11) =7235426a(12) =26643664a(13) =98112376a(14) =361288084a(15) =1330403818a(16) =4899066416a(17) =18040275760a(18) =66431340558a(19) =244626139148a(20) =900808977386
External references
- oeis: A207276