2581110
domain: N
Appears in sequences
- a(n) = floor(2^n / n).at n=25A000799
- Number of subsets of {1,2,..n} that sum to 1 mod n.at n=25A064355
- a(n) = round( 2^n/n ).at n=25A065482
- a(n) = floor of (2^n-1)/n.at n=25A082482
- Inverse Euler transform of central binomial coefficients A000984.at n=13A131764
- Number of n-bead necklaces of 5 colors allowing reversal, with no adjacent beads having the same color.at n=12A208541