%I #13 Feb 22 2021 13:25:12
%S 3,1,2,2,3,4,6,7,11,15
%N Number of distinct regular languages over unary 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,more
%O 1,1
%A _Hermann Gruber_, Apr 26 2012