918207domain: NAppears in sequencesNumber of orbits of length n under the map whose periodic points are counted by A001643.at n=27A060168Exponents f(n), n = 1, 2, ..., in the infinite product 1 - z - z^2 - z^3 = Product_{n>=1} (1-z^n)^f(n).at n=27A125951