90157

Appears in sequences

• Number of Barlow packings with group P63mc that repeat after 2n layers.at n=17A011948
• 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=23A059053
• Numbers which form a prime by appending a 3-digit odd number and form no primes by appending any 1- or 2-digit odd number not beginning with 0.at n=19A091089
• Number of (n+1)X(3+1) 0..1 arrays with every element equal to some horizontal or antidiagonal neighbor, with top left element zero.at n=4A232311
• T(n,k)=Number of (n+1)X(k+1) 0..1 arrays with every element equal to some horizontal or antidiagonal neighbor, with top left element zero.at n=25A232316
• Number of (5+1) X (n+1) 0..1 arrays with every element equal to some horizontal or antidiagonal neighbor, with top left element zero.at n=2A232321
• a(n) = A053656(n) - A000011(n).at n=22A256216
• Number of chiral pairs of set partitions of a primitive cycle of n elements having exactly two different elements.at n=23A308706
• 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=22A327734