200891

Properties

Appears in sequences

• a(n) = Sum_{k=0..floor(n/5)} (-1)^k * binomial(n-4*k,k) * Catalan(k).at n=40A360027
• Number of chordless cycles (of length >=4) in the complement of the n-Mycielski graph.at n=6A364994
• Prime numbersat n=18052