In reply to @neil_calkin

@neil_calkin @Quelklef I do! Lovely sequence.
This was prompted by me thinking that there's a huge gulf between binary-ish sequences that only use 0 and 1 or 1 and 2, and others with much bigger range. I should have asked for sequences with between 3 and 5 distinct elements.

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In reply to @christianp

@neil_calkin @Quelklef Hmm.. The Wikipedia illustration for the Calkin-Wilf tree only uses the numbers 1 to 5 😉

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