671092

Appears in sequences

• Definition (1): Number of n-bead binary necklaces with beads of 2 colors where the colors may be swapped but turning over is not allowed.at n=25A000013
• a(n) is the number of distinct (infinite) output sequences from binary n-stage shift register which feeds back the complement of the last stage.at n=25A000016
• Bisection of A000016 (also of A000013).at n=12A026119
• a(n) = Sum_{ d divides n } phi(d)*2^(n/d)/(2n).at n=22A053634
• Number of cyclic graphs with oriented edges on n nodes (up to symmetry of dihedral group).at n=24A053656
• Number of subsets of {1,2,3,...,n} that sum to 0 mod 25.at n=24A068043
• Number of solutions to 1 +- 2 +- 3 +- ... +- n == 0 (mod n).at n=24A300190
• Number of solutions to 1 +- 3 +- 5 +- ... +- (2*n-1) == 0 mod n.at n=24A300218
• a(n) is the number of 3 X 3 matrices with elements 1..n where at least one row and at least one column is strictly increasing.at n=6A390925