-1104971

Appears in sequences

• Expansion of (1-x)^(-1)/(1-x+2*x^2).at n=40A077876
• Expansion of g.f.: (1+3*x^2)/((1-x)*(1+x+2*x^2)*(1-x+2*x^2)).at n=40A107443
• Expansion of g.f.: (1+3*x^2)/((1-x)*(1+x+2*x^2)*(1-x+2*x^2)).at n=41A107443
• Expansion of g.f. (1+3*x)/((1-x)*(1+3*x+4*x^2)).at n=20A174565