158074

Appears in sequences

• Number of (w,x,y,z) with all terms in {1,...,n} and w*x < 2*y*z.at n=22A211795
• a(n) = Sum_{k=0..n} (k+1) * 2^(n-k) * binomial(2*k+1,2*n-2*k).at n=9A391893