374715

Appears in sequences

• Number of nonempty subsets of {1,2,...,n} in which exactly 1/3 of the elements are <= n/2.at n=22A047161
• Number of nonempty subsets of {1,2,...,n} in which exactly 1/3 of the elements are <= (n-1)/2.at n=22A047172
• Integers m such that A064992(m) = A064992(m+1).at n=22A065002
• Number of nXn 0..1 arrays with every element unequal to 0, 1 or 3 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.at n=19A317766