159360

Appears in sequences

• Number of squarefree integers not exceeding 2^n.at n=18A143658
• E.g.f. satisfies: A(x) = 1 + Sum_{n>=1} 2*cosh(n*x) * (x*A(x))^(n^2).at n=6A199576
• Number of n X 7 0..1 arrays with no element equal to more than one of its horizontal and vertical neighbors, with the exception of exactly two elements, and with new values introduced in order 0 sequentially upwards.at n=10A280553