1292445

Appears in sequences

• Number of aperiodic necklaces with n red or blue beads such that two necklaces are equivalent under the operation of simultaneously turning the necklace over and switching the two colors.at n=25A066313
• Exponential Riordan array, defining orthogonal polynomials related to permutations without double falls.at n=60A182822
• Odd numbers k for which gcd(A325977(k), A325978(k)) is equal to abs(A325978(k)).at n=18A325979