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 A234845 #7 Dec 31 2013 12:36:06 %S A234845 1,2,4,11,27,87,300,1259,5988,32812,202784,1400541,10669344,88761928, %T A234845 799112310 %N A234845 Number of commutative inverse monoids of order n. %H A234845 Martin E. Malandro, <a href="http://arxiv.org/abs/1312.7192">Enumeration of finite inverse semigroups</a>, arXiv:1312.7192 [math.CO] %Y A234845 Cf. A001428 (inverse semigroups), A234843 (commutative inverse semigroups), A234844 (inverse monoids). %K A234845 nonn,hard,more %O A234845 1,2 %A A234845 _Joerg Arndt_, Dec 31 2013