1693298688

Appears in sequences

• a(n) = 2*a(n-1) + 2*a(n-2), a(0)=0, a(1)=4.at n=21A116556
• 4 X 4 X 4 triangular graph without horizontal edges coloring a rectangular array: number of n X 1 0..9 arrays where 0..9 label nodes of a graph with edges 0,1 0,2 1,3 1,4 2,4 2,5 3,6 3,7 4,7 4,8 5,8 5,9 and every array movement to a horizontal or vertical neighbor moves along an edge of this graph.at n=19A223408