2097195

Appears in sequences

• Expansion of (2-2*x-x^2)/((1-2*x^2)*(1-x)^2).at n=42A016724
• a(n) = 2^n + 2*n + 1.at n=21A176691
• Expansion of Sum_{k>0} k * x^k / (1 - 2*x^(2*k)).at n=42A364035