1150592

Appears in sequences

• Twice A084773.at n=6A152254
• Number of non-nesting digraphs with vertices {1..n}, where two edges (a,b), (c,d) are nesting if a < c and b > d or a > c and b < d.at n=7A326237
• a(n) = A100631(n, floor(n/2)).at n=14A341344