1342176

Appears in sequences

• Number of degree-n irreducible polynomials over GF(2); number of n-bead necklaces with beads of 2 colors when turning over is not allowed and with primitive period n; number of binary Lyndon words of length n.at n=25A001037
• Product_{k>=1}1/(1 - x^k)^a(k) = 1 + 2x.at n=24A038063
• Product_{k>=1} (1 + x^k)^a(k) = 1 + 2x.at n=24A038067
• a(n) = (1/n) * Sum_{ d divides n } mu(n/d) * (2^d - 1).at n=24A059966
• Number of orbits of length n in map whose periodic points are A000051.at n=24A060477
• Number of orbits of length n in map whose periodic points come from A059990.at n=24A060480
• Number of subsets of {1,2,..n} that sum to 1 mod n.at n=24A064355
• a(n) = Sum_{k=0..n} floor(binomial(n,k)/(k+1)).at n=23A095718
• Related to sums of the n-th roots of unity: sums in a circular wedge (excluding the origin).at n=24A107847
• Number of solutions to +-1 +- 2 +- 3 +- ... +- n == n-1 (mod n).at n=24A300329
• Inverse Weigh transform of 2^n.at n=24A306156
• Inverse Euler transform of (-1)^(n - 1).at n=25A320783
• Inverse Weigh transform of 2^(n-1).at n=24A383034