Number of nX4 0..2 arrays avoiding the pattern z-1 z-1 z in any row, column or nw-to-se diagonal.
A206730
Number of nX4 0..2 arrays avoiding the pattern z-1 z-1 z in any row, column or nw-to-se diagonal.
Terms
- a(0) =69a(1) =4761a(2) =219714a(3) =9974630a(4) =448162001a(5) =20163037412a(6) =908849973079
External references
- oeis: A206730