[math-fun] OEIS A016825 has 28(?) characterizations,
15 Dec
2019
15 Dec
'19
10:12 p.m.
e.g., In[214]:= ContinuedFraction@Coth@.5 Out[214]= {2, 6, 10, 14, 18, 22, 26} e.g., the oddly even numbers. A 29th: Polar rose (r = cos(k t)) unachievable petal counts. (https://en.wikipedia.org/wiki/Polar_coordinate_system#Polar_rose) —rwg
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Bill Gosper