-11188

Appears in sequences

• Expansion of 1/(1-x+2*x^2+x^3).at n=20A077955
• Expansion of 1/(1+x+2*x^2-x^3).at n=20A077978
• a(n+3) = -a(n+2) - 2*a(n+1) + a(n) with a(0)=0, a(1)=0, a(2)=1.at n=22A276229