Number of nX2 0..3 arrays with every nonzero element less than or equal to some NW, E or S neighbor.
A203391
Number of nX2 0..3 arrays with every nonzero element less than or equal to some NW, E or S neighbor.
Terms
- a(0) =1a(1) =16a(2) =185a(3) =1455a(4) =10804a(5) =83876a(6) =661595a(7) =5187181a(8) =40522052a(9) =316707721a(10) =2476929279a(11) =19371658984a(12) =151484525968
External references
- oeis: A203391