140161

Appears in sequences

• Triangle read by rows: T(n,k) is the number of noncrossing trees with n edges in which the leftmost leaf is at level k.at n=49A101409
• a(n) = a(n-1) + a(n-2) + 2 a([(n-1)/2]), where a(0) = 1, a(1) = 1, a(2) = 1.at n=23A298354
• a(n) is the number of vertices in the n-fold iterated barycentric subdivision of a triangle (or 2-simplex).at n=7A380996