-6419

Appears in sequences

• a(n) = Sum_{k=0..floor(n/7)} (-1)^k*binomial(n,7*k).at n=15A307041
• First term of n-th difference sequence of (floor(k*r)), r = sqrt(3/4), k >= 0.at n=15A325732
• First term of n-th difference sequence of (floor(2e*k)), k >= 0.at n=16A325736
• E.g.f. A(x) satisfies A(x) = exp( x * cos(x * A(x)^2) ).at n=6A381409