public void CatalanTest()
 {
     Assert.AreEqual(1u, NumberSequence.Catalan(0));
     Assert.AreEqual(1u, NumberSequence.Catalan(1));
     Assert.AreEqual(2u, NumberSequence.Catalan(2));
     Assert.AreEqual(42u, NumberSequence.Catalan(5));
     Assert.AreEqual(16796u, NumberSequence.Catalan(10));
 }