54263

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=20A048005
• Number of nonempty subsets of {1,2,...,n} in which exactly 1/2 of the elements are <= (n-2)/3.at n=20A048016
• Number of nonempty subsets of {1,2,...,n} in which exactly 1/2 of the elements are <= (n-3)/3.at n=20A048027
• a(n) = binomial(n,6)-1.at n=15A124089
• Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, -1), (-1, 0, 0), (0, -1, 1), (0, 1, 0), (1, -1, 0)}.at n=11A148558