References to A126222

Triangle read by rows: T(n,k) is the number of 2-Motzkin paths (i.e. Motzkin paths with blue and red level steps) without red level steps on the x-axis, having length n and k level steps (0<=k<=n).
1, 0, 1, 1, 0, 1, 0, 4, 0, 1, 2, 0, 11, 0, 1, 0, 15, 0, 26, 0, 1, 5, 0, 69, 0, 57, 0, 1, 0, 56, 0

2 seqfan posts