Number of n X 2 0..2 arrays avoiding the pattern z z+1 z in any row, column, diagonal or antidiagonal.
A206857
Number of n X 2 0..2 arrays avoiding the pattern z z+1 z in any row, column, diagonal or antidiagonal.
Terms
- a(0) =9a(1) =81a(2) =625a(3) =4761a(4) =36481a(5) =279841a(6) =2146225a(7) =16459249a(8) =126225225a(9) =968018769a(10) =7423717921a(11) =56932346025a(12) =436613028289
External references
- oeis: A206857