20682

Appears in sequences

• Number of series-reduced dyslexic planted compound windmills with n leaves of 2 colors where any 2 submills extending from the same node are different.at n=10A032238
• Number of independent generators of degree n of the algebra of Free quasi-symmetric functions (or Malvenuto-Reutenauer algebra of permutations) as a dendriform dialgebra (i.e., number of totally primitive elements).at n=7A122827
• Triangle T(n,k) = A000142(n-k)*A003319(k+1) read by rows.at n=51A141476
• Triangle T(n,t) by rows: The number of rooted forests with n 3-colored nodes and t rooted trees.at n=23A271879
• Number of regions in a polygon whose boundary consists of n+2 equally spaced points around the arc of a semicircle. See Comments for precise definition.at n=25A333643