2762528

Appears in sequences

• a(n) = 4*a(n-1) + 2*a(n-2) for n>1, a(0)=0, a(1)=1.at n=11A090017
• Number of (n+1) X 3 binary arrays with every 2 X 2 subblock commuting with each of its horizontal and vertical 2 X 2 subblock neighbors.at n=28A186455