49940

Appears in sequences

• Definition (1): Number of n-bead binary necklaces with beads of 2 colors where the colors may be swapped but turning over is not allowed.at n=21A000013
• a(n) is the number of distinct (infinite) output sequences from binary n-stage shift register which feeds back the complement of the last stage.at n=21A000016
• Number of circulant tournaments on 2n+1 nodes up to Cayley isomorphism.at n=20A002086
• Bisection of A000016 (also of A000013).at n=10A026119
• Number of nonisomorphic circulant tournaments, i.e., Cayley tournaments for cyclic group of order 2n-1.at n=21A049288
• Number of nonisomorphic self-complementary circulant digraphs (Cayley digraphs for the cyclic group) of order 2n-1.at n=21A049309
• a(n) = Sum_{ d divides n } phi(d)*2^(n/d)/(2n).at n=18A053634
• Number of cyclic graphs with oriented edges on n nodes (up to symmetry of dihedral group).at n=20A053656
• Number of complementary pairs of circulant graphs on n nodes.at n=42A054929
• Number of subsets of {1,2,3,...,n} that sum to 0 mod 21.at n=20A068042
• Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, 0), (-1, -1, 1), (-1, 1, -1), (1, 0, 0), (1, 1, 0)}.at n=9A150058
• Number of partitions p of n such that median(p) >= multiplicity(max(p)).at n=42A240211
• Number of solutions to 1 +- 2 +- 3 +- ... +- n == 0 (mod n).at n=20A300190
• Number of solutions to 1 +- 3 +- 5 +- ... +- (2*n-1) == 0 mod n.at n=20A300218
• Number of nonisomorphic vertex-transitive tournaments of order 2n-1.at n=21A346179
• Table read by downward antidiagonals: T(n,k) is the number of tilings of the n X k torus up to horizontal reflections by a tile that is not fixed under horizontal reflection.at n=38A368306
• Table read by downward antidiagonals: T(n,k) is the number of tilings of the n X k torus up to horizontal reflections by a tile that is not fixed under horizontal reflection.at n=42A368306
• Table read by antidiagonals: T(n,k) is the number of tilings of the n X k torus up to 180-degree rotation by a tile that is not fixed under 180-degree rotation.at n=38A368308
• Table read by antidiagonals: T(n,k) is the number of tilings of the n X k torus up to 180-degree rotation by a tile that is not fixed under 180-degree rotation.at n=42A368308