Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| No. in series | No. in season | Title | Directed by | Written by | Original air date | Production code | U.S. viewers (millions) |
| --- | --- | --- | --- | --- | --- | --- | --- |
| 24.0 | 1.0 | "Camp Refoogee" | Albert Calleros | Josh Bycel & Jonathan Fener | September10,2006 | 2AJN06 | 8.93 |
| 25.0 | 2.0 | "The American Dad After School Special" | Pam Cooke | Dan Vebber | September17,2006 | 2AJN05 | 7.71 |
| 26.0 | 3.0 | "Failure is Not a Factory-Installed Option" | Rodney Clouden | Etan Cohen | September24,2006 | 2AJN07 | 8.36 |
| 27.0 | 4.0 | " Lincoln Lover " | Brent Woods | Rick Wiener & Kenny Schwartz & Nahnatchka Khan | November5,2006 | 2AJN11 | 7.71 |
| 28.0 | 5.0 | "Dungeons and Wagons" | Kurt Dumas & Anthony Lioi | Michael Shipley & Jim Bernstein | November12,2006 | 2AJN08 | 8.48 |
| 29.0 | 6.0 | "Iced, Iced Babies" | Caleb Meurer | Steve Hely | November19,2006 | 2AJN09 | 8.24 |
| 30.0 | 7.0 | "Of Ice and Men" | John Aoshima | Brian Boyle | November26,2006 | 2AJN10 | 8.76 |
| 31.0 | 8.0 | "Irregarding Steve" | Pam Cooke | Chris McKenna & Matt McKenna | December10,2006 | 2AJN12 | 7.11 |
| 32.0 | 9.0 | "The Best Christmas Story Never Told" | Albert Calleros | Brian Boyle | December17,2006 | 2AJN14 | N/A |
| 33.0 | 10.0 | "Bush Comes to Dinner" | Mike Kim | Mike Barker & Matt Weitzman | January7,2007 | 2AJN13 | 9.12 |
| 34.0 | 11.0 | "American Dream Factory" | Rodney Clouden | Nahnatchka Khan | January28,2007 | 2AJN16 | 7.49 |
| 35.0 | 12.0 | "A.T. the Abusive Terrestrial" | Joe Daniello | Dan Vebber | February11,2007 | 2AJN17 | 6.60 |
| 36.0 | 13.0 | "Black Mystery Month" | Brent Woods | Laura McCreary | February18,2007 | 2AJN20 | 7.06 |
| 37.0 | 14.0 | "An Apocalypse to Remember" | John Aoshima | Erik Durbin | March25,2007 | 2AJN19 | 6.64 |
| 38.0 | 15.0 | "Four Little Words" | Caleb Meurer | David Zuckerman | April1,2007 | 2AJN18 | 5.94 |
| 39.0 | 16.0 | "When a Stan Loves a Woman" | Rodney Clouden | Rick Wiener & Kenny Schwartz | April29,2007 | 2AJN23 | 6.71 |
| 40.0 | 17.0 | "I Can't Stan You" | Pam Cooke | Michael Shipley & Jim Bernstein | May6,2007 | 2AJN15 | 6.31 |
| 41.0 | 18.0 | "The Magnificent Steven" | Mike Kim | Steve Hely | May13,2007 | 2AJN21 | 5.67 |
Question:
What's the season number of the episode originally seen by 6.64 million people in the US?
Answer:
14.0