14053978

Appears in sequences

• a(0)=1, a(1)=1, a(2)=1, a(n) = 2*a(n-1) + a(n-2) + 1.at n=20A033539
• Expansion of (1 + 3*x - 2*x^2)/(1 - 7*x + 7*x^2 - x^3).at n=9A301383