From Tateyama Koen-guchi bus stop in direction of Nagasaki Station:
You will see two almost identical tables with departure times differing by two minutes. This is because the buses come up the mountain, stop near the park once, make a loop further up and then come back down and stop near the park once more two minutes later.
平日 means weekdays
土日祝 means weekends and national holidays
Departure times with a preceding 土 operate on Saturdays only. With a preceding 日 on Sundays only.