CREATE TABLE table_25766 ("No. in series" FLOAT, "Title" CLOB, "Directed by" CLOB, "Written by" CLOB, "Original air date" CLOB, "Production code" CLOB, "U.S. viewers  ( millions ) " CLOB)

What's the series number of the episode written by Dan Vebber?
SELECT MAX("No. in series") FROM table_25766 WHERE "Written by" = 'Dan Vebber'
SELECT MAX("No. in series") FROM "table_25766" WHERE "Written by" = 'Dan Vebber'