350568

Appears in sequences

• Number of nonempty subsets of {1,2,...,n} in which exactly 2/3 of the elements are <= (n+2)/3.at n=27A048073
• Number of nonempty subsets of {1,2,...,n} in which exactly 2/3 of the elements are <= (n+3)/3.at n=27A048084
• a(n) = 6*(n - 1)*(81*n - 104) for n >= 1.at n=27A304837