1/36 the number of (n+2) X 9 0..2 arrays with each 3 X 3 subblock containing two of one value, two of another, and five of the last.
A184455
1/36 the number of (n+2) X 9 0..2 arrays with each 3 X 3 subblock containing two of one value, two of another, and five of the last.
Terms
- a(0) =203391a(1) =216477a(2) =232326a(3) =253176a(4) =309042a(5) =413100a(6) =660654
External references
- oeis: A184455