43046640

Appears in sequences

• Number of irreducible polynomials of degree n over GF(9); dimensions of free Lie algebras.at n=9A027381
• Number of Lyndon words (aperiodic necklaces) with n beads of n colors.at n=8A075147
• Number of length n primitive (=aperiodic or period n) 9-ary words which are earlier in lexicographic order than any other word derived by cyclic shifts of the alphabet.at n=8A320074
• a(n) = Sum_{d|n} mu(n/d) * (-n)^(d-1).at n=8A383012