[seqfan] A sequence from Johannes Kepler's "Harmonices Mundi"
peter.luschny at gmail.com
Sat Feb 11 12:34:58 CET 2017
We all know Stern-Brocot, Dijkstra, and the Calkin and Wilf tree.
David Eppstein posted today on G+ this picture .
And Eppstein added to Wikipedia: "Even earlier, a similar tree appears in
Johannes Kepler's "Harmonices Mundi" (1619, volume=III, page=27)." 
Hope you like it as much as I do.
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