local fmt = require "fmt"
require "math2"

local function stirling(x)
    return math.sqrt(2 * math.pi / x) * ((x / math.e) ^ x)
end

print(" x\tStirling\t\tLanczos\n")
for i = 1, 20 do
    local d = i / 10
    fmt.print("%4.2f\t%0.14f\t%0.14f", d, stirling(d), math.gamma(d))
end