Number of nX3 0..2 arrays avoiding the patterns z z+1 z or z z-1 z in any row, column, diagonal or antidiagonal.
A207230
Number of nX3 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) =23a(1) =529a(2) =5853a(3) =79353a(4) =1089017a(5) =14540437a(6) =191801477a(7) =2533992385a(8) =33633408281a(9) =446969194245
External references
- oeis: A207230