Number of nX3 0..2 arrays avoiding the pattern z z+1 z in any row or column.
A207216
Number of nX3 0..2 arrays avoiding the pattern z z+1 z in any row or column.
Terms
- a(0) =25a(1) =625a(2) =12534a(3) =247163a(4) =4916282a(5) =97935886a(6) =1950327875a(7) =38835489653a(8) =773312516026
External references
- oeis: A207216