115457

Appears in sequences

• Number of (w,x,y,z) with all terms in {1,...,n} and w >= |x-y| + |y-z|.at n=23A212675
• a(n) = Sum_{1 <= i, j, k, l <= n} gcd(i,j,k,l).at n=17A344523
• a(n) = [x^n] Product_{k=1..n} (x^(k^3) + 1 + 1/x^(k^3)).at n=20A369437