26931

Appears in sequences

• Number of n-bead necklaces with beads of 2 colors and primitive period n, when turning over is allowed.at n=20A001371
• Number of partitions satisfying cn(2,5) + cn(3,5) <= cn(0,5) + cn(1,5) + cn(4,5).at n=39A039867
• Number of primitive (period n) bracelets using exactly two different colored beads.at n=19A056348
• a(n) = 997*n + 1009.at n=26A100776
• Number of isomers of polyhex hydrocarbons with C_(2h) symmetry with nineteen hexagons.at n=11A120386