Number of nX4 0..2 arrays avoiding the patterns z z+1 z or z z-1 z in any row, column or nw-se diagonal.
A207224
Number of nX4 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) =61a(1) =3721a(2) =100997a(3) =3447649a(4) =115679881a(5) =3814387801a(6) =125372637881
External references
- oeis: A207224