773888domain: NAppears in sequencesNumber of tilings of a 3 X n rectangle using 2 X 2 tiles, right trominoes and dominoes.at n=11A354011Triangle read by rows: T(n,k) is the number of maximal chains in the poset of all k-ary words of length <= n, ordered by B covers A iff A_i <= B_{i+k} for all i in A and some k >= 0.at n=50A378588