9740686

Appears in sequences

• a(n) = 2^(n-1) + ((1 + (-1)^n)/4)*binomial(n, n/2).at n=24A027306
• a(n) = Sum_{i=0..n} binomial(2*n, i).at n=12A032443
• Expansion of ((1 + x - 2x^2) + (1+x)*sqrt(1-4x^2))/(2(1-4x^2)).at n=25A116406
• Expansion of g.f. (1+z)^(24)/(1-z).at n=12A171445
• a(n) = Sum_{k=0..12} binomial(n,k).at n=24A219615