Number of nX3 0..3 arrays with exactly floor(nX3/2) elements equal to at least one horizontal, vertical or antidiagonal neighbor, with new values introduced in row major 0..3 order.
A222719
Number of nX3 0..3 arrays with exactly floor(nX3/2) elements equal to at least one horizontal, vertical or antidiagonal neighbor, with new values introduced in row major 0..3 order.
Terms
- a(0) =0a(1) =30a(2) =1683a(3) =88552a(4) =2807505a(5) =173596622a(6) =5700425842a(7) =361481561727
External references
- oeis: A222719