898780

Appears in sequences

• Expansion of (1-2*x^3)/(1-2*x-x^3+2*x^4).at n=20A057744
• a(0)=a(1)=a(2)=1, a(n) = a(n-1) + a(n-2) + 2*a(n-3) for n > 2.at n=21A122552
• a(n) = a(n-1) + a(n-2) + 2a(n-3).at n=21A140295