Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: 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?

### Accurate SQL ###

SELECT no_in_series FROM table_18055005_1 WHERE viewers__millions_ = "4.1" AND written_by = "Douglas Lieblein"