What is King Wen Sequence?

The traditional ordering of the 64 hexagrams, attributed to King Wen of Zhou. This is the sequence used in the received text of the I-Ching, where hexagrams are arranged in complementary pairs. It differs from the Earlier Heaven (Fu Xi) binary sequence used in cosmological systems.

Source: Xugua Zhuan (序卦傳), Sequence of the Hexagrams