162212

Appears in sequences

• G.f. A(x) satisfies: 1 - x*A(x) + x^2*A(x)^2 = Sum_{n>=0} (-x)^(n^2).at n=12A217699
• Numbers w + x + y + z where (w,x,y,z) are nonnegative solutions to the Diophantine equation w^2 + x^2 + y^2 + z^2 = w*x*y*z.at n=17A385713