What is the number of attendance values for ties having an opponent of Middlesbrough and result of 3-1?
CREATE TABLE table_63249 (
    "Date" text,
    "Opponent" text,
    "Venue" text,
    "Result" text,
    "Attendance" real
)
SELECT COUNT("Attendance") FROM table_63249 WHERE "Opponent" = 'middlesbrough' AND "Result" = '3-1'
Below are sql tables schemas paired with instruction that describes a task. Using valid SQLite, write a response that appropriately completes the request for the provided tables. ### Instruction: What is the number of attendance values for ties having an opponent of Middlesbrough and result of 3-1? ### Input: CREATE TABLE table_63249 (
    "Date" text,
    "Opponent" text,
    "Venue" text,
    "Result" text,
    "Attendance" real
) ### Response: SELECT COUNT("Attendance") FROM table_63249 WHERE "Opponent" = 'middlesbrough' AND "Result" = '3-1'