RosettaCodeData/Task/Catalan-numbers/Lua/catalan-numbers.lua

-- recursive with memoization
local catalan = { [0] = 1 }
setmetatable(catalan, {
    __index = function(c, n)
        c[n] = c[n - 1] * 2 * (2 * n - 1) / (n + 1)
        return c[n]
    end
})

for i = 0, 14 do
    print(string.format("%d", catalan[i]))
end