This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A158291 #12 Jun 02 2025 01:26:34
%S A158291 1,2,3,6,10,20,37,74,140,280,542,1084,2118,4236,8337,16674
%N A158291 The number of numerical sets S with atom monoid A(S) equal to {0,n+1,n+2,n+3,n+4,...}.
%H A158291 S. R. Finch, <a href="http://www.people.fas.harvard.edu/~sfinch/">Monoids of natural numbers</a>
%H A158291 S. R. Finch, <a href="/A066062/a066062.pdf">Monoids of natural numbers</a>, March 17, 2009. [Cached copy, with permission of the author]
%H A158291 J. Marzuola and A. Miller, <a href="http://arxiv.org/abs/0805.3493">Counting Numerical Sets with No Small Atoms</a>, arXiv:0805.3493 [math.CO], 2008.
%H A158291 J. Marzuola and A. Miller, <a href="https://doi.org/10.1016/j.jcta.2010.03.002">Counting numerical sets with no small atoms</a>, J. Combin. Theory A 117 (6) (2010) 650-667.
%Y A158291 Cf. A066062.
%K A158291 nonn,more
%O A158291 1,2
%A A158291 _Steven Finch_, Mar 15 2009