CREATE TABLE table_17624965_1 (written_by VARCHAR, directed_by VARCHAR)

How many episodes did Alison Maclean direct?
SELECT COUNT(written_by) FROM table_17624965_1 WHERE directed_by = "Alison Maclean"
SELECT COUNT("written_by") FROM "table_17624965_1" WHERE "Alison Maclean" = "directed_by"