Number of nX6 0..2 arrays avoiding the patterns z z+1 z or z z-1 z in any row, column or nw-se diagonal.
A207226
Number of nX6 0..2 arrays avoiding the patterns z z+1 z or z z-1 z in any row, column or nw-se diagonal.
Terms
- a(0) =425a(1) =180625a(2) =21553541a(3) =3814387801a(4) =648206318305
External references
- oeis: A207226