Table schema:
CREATE TABLE table_18055005_1 (no_in_series VARCHAR, viewers__millions_ VARCHAR, written_by VARCHAR)

Question: What's the series number of the episode originally viewed by 4.1 million people and written by Douglas Lieblein?
SQL: SELECT no_in_series FROM table_18055005_1 WHERE viewers__millions_ = "4.1" AND written_by = "Douglas Lieblein"