24879489

Appears in sequences

• Number of n X n binary matrices with every 1 adjacent to some 0 horizontally, vertically, diagonally or antidiagonally.at n=4A133791
• Hilltop maps: number of nX5 binary arrays indicating the locations of corresponding elements not exceeded by any king-move neighbor in a random 0..1 nX5 array.at n=4A218660
• T(n,k) = Hilltop maps: number of n X k binary arrays indicating the locations of corresponding elements not exceeded by any king-move neighbor in a random 0..1 n X k array.at n=40A218663