130732

Appears in sequences

• Number of (w,x,y,z) with all terms in {1,...,n} and w>=2x and y<=3z.at n=28A212521
• G.f.: exp( Sum_{n>=1} A064027(n)*x^n/n ), where A064027(n) = (-1)^n*Sum_{d|n}(-1)^d*d^2.at n=23A224364