Explanation
Over the centuries there were many attempts to explain this sequence. Some basic elements are obvious: each symbol is paired with an "upside-down" neighbor, except for 1, 27, 29, and 61 which are "vertically" symmetrical and paired with "inversed" neighbors.
Its combinatorial mathematical basis was reportedly explained for the first time in 2006.
Read more about this topic: King Wen Sequence
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