4913620

Appears in sequences

• a(n) = 4^n * Sum_{i=1..n} i^4/4^i.at n=9A067534
• For 1<=x<=n, 1<=y<=n, write gcd(x,y) = u*x+v*y with u,v minimal; a(n) = n^4*s, where s is the population variance of the values of u^2+v^2.at n=13A345691