Number of nX3 0..3 arrays avoiding the patterns z z+1 z or z z-1 z in any row, column or nw-se diagonal.
A207474
Number of nX3 0..3 arrays avoiding the patterns z z+1 z or z z-1 z in any row, column or nw-se diagonal.
Terms
- a(0) =58a(1) =3364a(2) =133556a(3) =5632964a(4) =236422326a(5) =9918542118a(6) =415949940602
External references
- oeis: A207474