191673

Appears in sequences

• a(n) = Sum_{i=0..n} binomial(i,floor(i/2)).at n=19A036256
• E.g.f.: 1/(cos(x) - sin(x)*sinh(x)), omitting the zero-valued coefficients of odd powers of x.at n=4A227051
• a(n) = Sum_{k=0..n} (3*k+2)*Catalan(k).at n=9A274104