-18850

Appears in sequences

• Expansion of (1 - 2*x^2)/(1 + x)^5. Fourth column of Riordan triangle A248156.at n=28A248160
• G.f. A(x) satisfies: 1 = Sum_{n>=0} x^n * (1 + x^n*A(x))^n / (1 + x^(n+1)*A(x))^(n+1).at n=12A354124