17669353

Appears in sequences

• Expansion of (1-x)/(1+x-2*x^2-x^3).at n=28A078038
• a(n) = a(n-1) + 2*a(n-2) - a(n-3), where a(0) = 2, a(1) = 4, a(2) = 7.at n=27A287381