1048545

Appears in sequences

• Hilltop maps: number of n X 4 binary arrays indicating the locations of corresponding elements not exceeded by any king-move neighbor in a random 0..3 n X 4 array.at n=4A218238
• Hilltop maps: number of nX5 binary arrays indicating the locations of corresponding elements not exceeded by any king-move neighbor in a random 0..3 nX5 array.at n=3A218239
• T(n,k)=Hilltop maps: number of nXk binary arrays indicating the locations of corresponding elements not exceeded by any king-move neighbor in a random 0..3 nXk array.at n=31A218242
• T(n,k)=Hilltop maps: number of nXk binary arrays indicating the locations of corresponding elements not exceeded by any king-move neighbor in a random 0..3 nXk array.at n=32A218242
• Number of length-4 0..n arrays with no adjacent pair x,x+1 repeated.at n=31A269657
• a(n) = 4^n - 3*n - 1.at n=9A289254