Confirming the Kleitman-Winston Conjecture on the Largest Coefficient in a q-Catalan Number

Abstract In 1983 Kleitman and Winston conjectured that the largest coefficient in an n th q -Catalan number is of order O (4 n / n 3/2 ). Assuming its truth, they proved that the total number of n -tournament score sequences is O (4 n / n 5/2 ), thus matching their own lower bound. Our purpose is to confirm the conjecture.