Number of n X 2 0..2 arrays avoiding the pattern z-1 z-1 z in any row, column or nw-to-se diagonal.
A206728
Number of n X 2 0..2 arrays avoiding the pattern z-1 z-1 z in any row, column or nw-to-se diagonal.
Terms
- a(0) =9a(1) =81a(2) =625a(3) =4761a(4) =36100a(5) =273529a(6) =2073600a(7) =15721225a(8) =119202724a(9) =903844096a(10) =6853356225a(11) =51965305681a(12) =394024865796
External references
- oeis: A206728