How many different values of clubs involved were there when the league entering at this round was allsvenskan?
CREATE TABLE table_29566686_1 (
    clubs_involved VARCHAR,
    leagues_entering_at_this_round VARCHAR
)
SELECT COUNT(clubs_involved) FROM table_29566686_1 WHERE leagues_entering_at_this_round = "Allsvenskan"
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: How many different values of clubs involved were there when the league entering at this round was allsvenskan? ### Input: CREATE TABLE table_29566686_1 (
    clubs_involved VARCHAR,
    leagues_entering_at_this_round VARCHAR
) ### Response: SELECT COUNT(clubs_involved) FROM table_29566686_1 WHERE leagues_entering_at_this_round = "Allsvenskan"