154276028

Appears in sequences

• a(n) = 2^(n-1) + ((1 + (-1)^n)/4)*binomial(n, n/2).at n=28A027306
• a(n) = Sum_{i=0..n} binomial(2*n, i).at n=14A032443
• Expansion of ((1 + x - 2x^2) + (1+x)*sqrt(1-4x^2))/(2(1-4x^2)).at n=29A116406
• Sum_{k=0..14} binomial(n,k).at n=28A220051