2096127

Appears in sequences

• Number of 2n-bead balanced binary necklaces of fundamental period 2n, equivalent to reversed complement; also Dirichlet convolution of b_n=2^(n-1) with mu(n); also number of components of Mandelbrot set corresponding to Julia sets with an attractive n-cycle.at n=21A000740
• Number of primitive (aperiodic) word structures of length n which contain exactly two different symbols.at n=21A056278
• Number of primitive (aperiodic) palindromic structures of length n using a maximum of two different symbols.at n=44A056476
• Number of primitive (aperiodic) palindromic structures using exactly two different symbols.at n=44A056481
• Expansion of (1-3*x+3*x^2)/(1-5*x+10*x^2-10*x^3+4*x^4).at n=21A098179
• Binary palindromic numbers with only one 0 bit.at n=10A129868
• Decimal representation of the n-th iteration of the "Rule 203" elementary cellular automaton starting with a single ON (black) cell.at n=10A267685
• Decimal representation of the n-th iteration of the "Rule 217" elementary cellular automaton starting with a single ON (black) cell.at n=10A267812
• Main diagonal of A274637.at n=21A274638
• Decimal representation of the diagonal from the corner to the origin of the n-th stage of growth of the two-dimensional cellular automaton defined by "Rule 515", based on the 5-celled von Neumann neighborhood.at n=20A288827
• Decimal representation of the diagonal from the origin to the corner of the n-th stage of growth of the two-dimensional cellular automaton defined by "Rule 515", based on the 5-celled von Neumann neighborhood.at n=20A288828
• a(n) = Sum_{d|n, gcd(d, n/d) = 1} (-1)^omega(n/d) * 2^(d-1).at n=21A343440