250707

Appears in sequences

• Expansion of g.f.: (1-x)*(1+2*x)/((1+x)*(1-3*x+x^2)).at n=13A129905
• a(n) = a(n-1) + a(n-3) + a(n-4), where a(0) = 2, a(1) = 0, a(2) = 1, a(3) = 1.at n=28A295684