133722

Appears in sequences

• Number of 3-element ordered antichain covers of an unlabeled n-element set.at n=16A056074
• a(1) = 1 and for any n > 1, if A330647(n) divides a(n-1) then a(n) = a(n-1) / A330647(n), otherwise a(n) = a(n-1) * A330647(n).at n=25A330648