Dendrobium trantuanii
orchid seeds

Dendrobium trantuanii, an orchid native to Vietnam, where it grows epiphytic on trees at an altitude of 800 to 1000 meters above sea level. The plant consists of bulbs which are 7 cm to 11 cm wide and 20 cm long. The leaves are 8 cm long and 4 cm wide. Violet flowers 3 – 3.5 cm

Orchid seeds are very small almost like dust and therefore not really countable. The amount of seeds will be between 50 - 100+ 

There are 4 methods of

sowing orchid seeds : 

1. Sowing the orchid seeds next to an orchid from the same genus
2. Sowing on a piece of bark
3. Sowing the orchid seeds using the so-called 'towel method'
4. Sowing over boiling water

All 4 procedures are described in detail on the website of the Orchid Forum:
Orchid Forum

price is for approx 50 seeds.