20132660

Appears in sequences

• Expansion of (1-x^2)/((1-2*x)*(1+x^2)).at n=25A100088
• a(n) = a(n-1) + a(n-2) + a(n-3) + 2*a(n-4) with a(0)=2, a(1)=1, a(2)=5, a(3)=10.at n=24A226309