467027

Appears in sequences

• Number of 4-tuples (w,x,y,z) with all terms in {1,...,n} and w*x<=3*y*z.at n=28A211812
• a(n) is the number of five element sets of distinct integer-sided trapezoids whose base angles are 60 degrees that fill an equilateral triangular grid of side n units.at n=41A391498