19131875

Appears in sequences

• Number of alpha-beta evaluations in a tree of depth n and branching factor b=3.at n=29A060647
• a(n) = 4*3^n-1.at n=14A171498
• a(n) = 4*9^n-1.at n=7A198961
• Expansion of (1+3*x+5*x^2-x^3)/((1-x^2)*(1-3*x^2)).at n=29A220944
• Expansion of g.f.: (1 + x - 2*x^2 + 2*x^4)/((1-x)*(1-3*x^2)).at n=30A358027