9806280

Appears in sequences

• Number of diagonal dissections of an n-gon into 5 regions.at n=16A033277
• Number of ways of arranging n chords on a circle (handshakes between 2n people across a table) with exactly 2 simple intersections.at n=12A074922
• a(n) = lcm({i + 1, i = 0..n}) / Product_{d | n, d + 1 prime} d.at n=24A362989
• Column 3 in A104978.at n=10A383452