192129

Appears in sequences

• a(n) = floor(C(n,6)/7).at n=34A011797
• T(n,7), array T as in A051168; a count of Lyndon words; aperiodic necklaces with 7 black beads and n-7 white beads.at n=28A051172
• G.f. satisfies: A(x) = exp( Sum_{n>=1} A(sigma(n)*x^n)*x^n/n ).at n=14A179468
• a(n) = (1/(5*n)) * Sum_{d|n} mu(n/d) * binomial(5*d,d).at n=6A346579