2220074
domain: N
Appears in sequences
- Number of nonempty subsets of {1,2,...,n} in which exactly 1/2 of the elements are <= (n-1)/3.at n=26A048005
- Number of nonempty subsets of {1,2,...,n} in which exactly 1/2 of the elements are <= (n-2)/3.at n=26A048016
- Number of nonempty subsets of {1,2,...,n} in which exactly 1/2 of the elements are <= (n-3)/3.at n=26A048027
- a(n) = binomial(n+8,8) - 1.at n=19A165618