503685

Appears in sequences

• E.g.f.: -arcsin(log(x+1)-arctanh(x)) (even powers only).at n=5A013295
• Number of nonempty subsets of {1,2,...,n} in which exactly 2/5 of the elements are <= (n+1)/3.at n=22A048044
• Number of nonempty subsets of {1,2,...,n} in which exactly 2/5 of the elements are <= (n+2)/3.at n=22A048077
• Number of nonempty subsets of {1,2,...,n} in which exactly 2/5 of the elements are <= (n+3)/3.at n=22A048088