3028320

Appears in sequences

• Number of circular permutations of length n without increasing or decreasing 3-sequences.at n=10A165964
• G.f. A(x) satisfies A(x) = 1/( 1 - x*(A(x) + A(-x))*(A(x) + A(w*x) + A(w^2*x))/6 ), where w = exp(2*Pi*i/3).at n=17A385699