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 A210581 #36 Apr 12 2021 00:22:18 %S A210581 1,2,7,23,68,200,615,1764,5060,14626,41785,117573,332475,933891, %T A210581 2609832,7278512 %N A210581 Bras-Amorós number f_n for numerical semigroups of genus n. %H A210581 M. Bernardini, Fernando Torres, <a href="http://arxiv.org/abs/1612.01212">Counting numerical semigroups by genus and even gaps</a>, arXiv:1612.01212 [math.CO], 2016-2017; Discrete Mathematics 340.12 (2017): 2853-2863. %H A210581 Maria Bras-Amorós, <a href="http://arxiv.org/abs/1203.5000">Ordinarization Transform of a Numerical Semigroup and Semigroups with a Large Number of Intervals</a>, arXiv:1203.5000 [math.NT], 2012. See Table on p. 11. %Y A210581 Cf. A007323, A124506. %K A210581 nonn,hard,more %O A210581 0,2 %A A210581 _Jonathan Vos Post_, Mar 22 2012 %E A210581 a(15) from _Maria Bras-Amorós_, Mar 23 2021