Number of nX4 0..2 arrays avoiding the patterns z z+1 z or z z-1 z in any row, column, diagonal or antidiagonal.
A207231
Number of nX4 0..2 arrays avoiding the patterns z z+1 z or z z-1 z in any row, column, diagonal or antidiagonal.
Terms
- a(0) =61a(1) =3721a(2) =79353a(3) =2464241a(4) =77937497a(5) =2320163321a(6) =68168506265
External references
- oeis: A207231