Here are links to Youtube videos of the initial series of Shotokan Karate katas, as taught at Hastings Martial Arts.
Taikyoku SHodan - The First Cause form
Heian Shodan - the First Heian form
Heian Nidan - the Second Heian form
Heian Sandan - the Third Heian form
Heian Yondan - the Fourth Heian form