228740

Appears in sequences

• Number of general plane trees whose n-th subtree from the left is equal to the n-th subtree from the right, for all its subtrees (i.e., are palindromic in the shallow sense).at n=13A073192
• Convolution of A000108 (Catalan numbers) with A126120 (Catalan numbers interpolated with 0's).at n=12A161006
• a(1) = 2, a(2) = 3; thereafter a(n) = a(n-1) + a(|n-a(T)|), where a(T) is the largest term in the sequence before a(n) such that 0 < |n-a(T)| < n.at n=48A271063
• Number of excursions of length n with Motzkin-steps avoiding the consecutive steps UD, HU, HH and DH.at n=32A329691