333498

Appears in sequences

• Number of Barlow packings with group P63mc that repeat after 2n layers.at n=19A011948
• Number of chiral pairs of necklaces with n beads and two colors (color complements being equivalent); i.e., turning the necklace over neither leaves it unchanged nor simply swaps the colors.at n=25A059053
• a(n) = A053656(n) - A000011(n).at n=24A256216
• Number of chiral pairs of set partitions of a primitive cycle of n elements having exactly two different elements.at n=25A308706
• Number of n-bead bracelet structures using exactly two different colored beads that are not self-equivalent under either a nonzero rotation or reversal (turning over bracelet).at n=24A327734