190650

Appears in sequences

• a(n) = floor(2^n / n).at n=21A000799
• Number of subsets of {1,2,..n} that sum to 1 mod n.at n=21A064355
• a(n) = round( 2^n/n ).at n=21A065482
• a(n) = floor of (2^n-1)/n.at n=21A082482
• Inverse Euler transform of central binomial coefficients A000984.at n=11A131764
• Base-10 representation of numbers k which, in base 2, satisfy abs(k + reverse(k) - reverse(k + reverse(k))) = abs(k - reverse(k)) + reverse(abs(k - reverse(k))) = k.at n=16A179697
• Number of n-bead necklaces of 5 colors allowing reversal, with no adjacent beads having the same color.at n=10A208541
• Triangle read by rows, with T(n,k) giving the number of n X n Boolean matrices with exactly k ones that have no zero rows and at least one zero column.at n=48A392482