[seqfan] Holes

Hans Havermann gladhobo at bell.net
Mon Oct 5 06:38:35 CEST 2020


KN writes that a(n) is "the total number of holes in a variation of a box fractal as in illustration". The illustration link for n = 1..4  has the second fractal as "hole = 22" but I count 28 (or 30 if the bigger voids are to be counted as well), so I am confused.

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