private static List<Integer> getBaseNodesAux(TREE<Integer> baseTree, List<Integer> list, Node node, int nodeBaseLevel, int count) {
        if (node == null) {
            return null;
        }

        if (node.getLeft() == null && node.getRight() == null) {
            if (count == nodeBaseLevel - 1) {
                list.add((Integer) node.getElement());
                return list;
            } else {
                if (list.indexOf(node) == -1) {
                    list.add((Integer) node.getElement());
                    count++;
                    getBaseNodesAux(baseTree, list, baseTree.root.getRight(), nodeBaseLevel, count);
                }
            }
        }

    }