89831

Appears in sequences

• Engel expansion of sin(2).at n=12A067920
• Number of n X 4 binary arrays without the pattern 0 1 diagonally or vertically.at n=32A188838
• G.f.: -sqrt(1 - 4*x)*(2*x - 1)/(3*x - 1).at n=11A320827
• Number of vertices in a graph of n adjacent rectangles in a row with all possible diagonals drawn, as in A306302, but without the rectangles' edges which are perpendicular to the row.at n=28A369176