user: Question: What's the series number of the episode written by Dan Vebber?
Columns: ['No. in series', 'Title', 'Directed by', 'Written by', 'Original air date', 'Production code', 'U.S. viewers (millions)']
Types: ['real', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: [1.0, '"Pilot"', 'Ron Hughart', 'Seth MacFarlane , Mike Barker & Matt Weitzman', 'February 6, 2005', '1AJN01', '15.10']
SQL:

assistant: SELECT "No. in series" FROM "Table" WHERE "Written by" = 'Dan Vebber';