2225195

Appears in sequences

• Triangular array read by rows. T(n,k) is the number of labeled relations on n elements with exactly k vertices of indegree and outdegree = 0.at n=31A217436
• Number of length n+1 0..6 arrays with the sum of the maximum of each adjacent pair multiplied by some arrangement of +-1 equal to zero.at n=6A250644
• Number of length 7+1 0..n arrays with the sum of the maximum of each adjacent pair multiplied by some arrangement of +-1 equal to zero.at n=5A250651