646645

Appears in sequences

• Euler characteristics of polytopes.at n=22A006482
• Number of nonempty subsets of {1,2,...,n} in which exactly 1/2 of the elements are <= (n-1)/2.at n=22A047171
• Number of nonempty subsets of {1,2,...,n} in which exactly 1/2 of the elements are <= (n-2)/2.at n=21A047182
• a(n) = binomial(2*n + 2, n + 2) - 1.at n=10A322938