79293domain: NAppears in sequencesNumber of step cyclic shifted sequence structures using exactly three different symbols.at n=16A056435Number of primitive (period n) step cyclic shifted sequence structures using exactly three different symbols.at n=16A056445G.f. satisfies: A(x) = 1 + Sum_{n>=1} x^n*A(x)^(2^n).at n=8A159609