1099385

Appears in sequences

• Expansion of (1-x)/(1-x+2*x^2-x^3).at n=49A078019
• Expansion of x*(1 - x^2)/(1 - x + 7*x^2 + x^3).at n=15A174792
• a(n) = 3*a(n-1) - 2*a(n-2) - a(n-3), with a(0)=1, a(1)=3 and a(2)=7.at n=23A368205