1238664

Appears in sequences

• Number of Barlow packings with group P63mc that repeat after 2n layers.at n=21A011948
• Number of chiral pairs of set partitions of a primitive cycle of n elements having exactly two different elements.at n=27A308706
• 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=26A327734