3756519domain: NAppears in sequencesNumber of (s(0), s(1), ..., s(2n+1)) such that 0 < s(i) < 9 and |s(i) - s(i-1)| = 1 for i = 1,2,...,2n+1, s(0) = 1, s(2n+1) = 4.at n=12A094827Expansion of (x^2)/[(1-x)*(1-3*x^2-x^3)].at n=26A188021