public function dataProviderForLucasNumber() { return [[-1, []], [0, []], [1, [2]], [2, [2, 1]], [3, [2, 1, 3]], [4, [2, 1, 3, 4]], [5, [2, 1, 3, 4, 7]], [6, [2, 1, 3, 4, 7, 11]], [11, [2, 1, 3, 4, 7, 11, 18, 29, 47, 76, 123]]]; }