469568

Appears in sequences

• Expansion of g.f. A(x) satisfying A( A(x)^2 ) = x*A(x)/(1 - 2*A(x)).at n=9A372527
• a(n) is the smallest nonnegative integer k where exactly n pairs of positive integers (x, y) exist such that x^2 + 7*y^2 = k.at n=20A374159