Narayana number

== English == === Etymology === Named after Canadian mathematician T. V. Narayana (1930–1987). === Noun === Narayana number (plural Narayana numbers) (combinatorics) Any of the triangular array of natural numbers defined by N(n, k), n = 1, 2, 3 ..., 1 ≤ k ≤ n, occurring in various counting problems. ==== Related terms ==== Narayana triangle