17302033

Appears in sequences

• Number of Barlow packings with group P63mc that repeat after 2n layers.at n=25A011948
• 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=31A059053
• a(n) = A053656(n) - A000011(n).at n=30A256216
• Number of chiral pairs of set partitions of a primitive cycle of n elements having exactly two different elements.at n=31A308706