460737domain: NAppears in sequencesNumber of paths along a corridor width 8, starting from one side.at n=22A061551Number 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) = 4, s(2n) = 4.at n=11A094854