1769365domain: NAppears in sequencesExpansion of 1/(1 - 3*x^2 - x^3).at n=24A052931Number of (s(0), s(1), ..., s(2n)) such that 0 < s(i) < 9 and |s(i) - s(i-1)| = 1 for i = 1,2,...,2n, s(0) = 1, s(2n) = 3.at n=12A094826