55192

Appears in sequences

• a(n) = (1/n) * Sum_{d|n} phi(n/d)*2^(d+1).at n=18A161219
• Partial sums of A033616.at n=48A299902
• Number of binary toroidal necklaces of size n.at n=19A323859
• Irregular table read by rows: Take a diagonal-edged (or diamond-shaped) checkerboard with all diagonals drawn, as in A333434. Then T(n,k) = number of k-sided polygons in that figure for k >= 3.at n=32A333458