CREATE TABLE table_18055005_1 (no_in_series VARCHAR(255), viewers__millions_ VARCHAR(255), written_by VARCHAR(255))
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"