Benchmark fibonacci on F#

Program.fs

// Learn more about F# at http://fsharp.org

open BenchmarkDotNet.Attributes
open BenchmarkDotNet.Running

let rec fibonacci n =
    match n with
    | 1 -> 1
    | 2 -> 2
    | n -> fibonacci (n - 1) + fibonacci (n - 2)

let fibonacci2 n =
    [ 1 .. n ] |> List.fold (+) 0

type FibonacciBenchmark() =
    [<Params(10, 20, 30)>]
    member val n = 0 with get, set

    [<Benchmark>]
    member self.BenchFibonacci() = fibonacci self.n

    [<Benchmark>]
    member self.BenchFibonacci2() = fibonacci2 self.n


[<EntryPoint>]
let main _argv =
    let _summary =
        BenchmarkRunner.Run<FibonacciBenchmark>()

    0 // return an integer exit code