162062

Appears in sequences

• Expansion of exp( Sum_{n>=1} -sigma_6(n)*x^n/n ) in powers of x.at n=7A283336
• Mark the points of the Farey series F_n on a strip of paper and wrap it around a circle of circumference 1 so the endpoints 0 and 1 coincide; draw a chord between every pair of the Farey points; a(n) is the number of vertices in the resulting graph.at n=11A359116