F# program to print Fibonacci Series using Match With

Program

open System
let rec fibonacci n =
    match n with
    | 0 | 1 -> 1
    | n -> fibonacci (n-1) + fibonacci (n-2)
Console.Write("Enter the number to get the fibonacci series:\t")
let number = Int32.Parse(Console.ReadLine())
let series =  fibonacci number
Console.WriteLine("Fibonnaci series of {0} using Match With is {1}\t", number, series); 

Output

Enter the number to get the fibonacci series:   7
Fibonnaci series of 7 using Match With is 21