31401
domain: N
Appears in sequences
- Number of nonempty subsets of {1,2,...,n} in which exactly 1/3 of the elements are <= n/2.at n=18A047161
- Number of nonempty subsets of {1,2,...,n} in which exactly 1/3 of the elements are <= (n-1)/2.at n=18A047172
- Numerator of (1^2/n + 2^2/(n-1) + ... + k^2/(n-k+1) + ... + (n-1)^2/2 + n^2/1).at n=7A119389
- Partial sums of A080715.at n=40A268403