Number of (n+2)X3 0..2 arrays with 3X3 subblock sums nondecreasing rightwards and downwards.
A186622
Number of (n+2)X3 0..2 arrays with 3X3 subblock sums nondecreasing rightwards and downwards.
Terms
- a(0) =19683a(1) =317115a(2) =5109075a(3) =82312875a(4) =1033357725a(5) =12972796635a(6) =162860787181
External references
- oeis: A186622