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%I #14 Feb 22 2021 13:23:18
%S 5,3,15,33,106,361,1012,3859,11655,43431
%N Number of distinct regular languages over 3-ary alphabet, whose minimum regular expression has reverse Polish length n.
%H Hermann Gruber, Jonathan Lee, and Jeffrey Shallit, <a href="http://arxiv.org/abs/1204.4982">Enumerating regular expressions and their languages</a>, arXiv:1204.4982v1 [cs.FL], 2012.
%K nonn,hard
%O 1,1
%A _Hermann Gruber_, Apr 26 2012
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