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 A215018 #9 Apr 05 2018 22:40:14 %S A215018 1,3,7,26,91,490,2785,20434,171579,1671193,18192737,218487504 %N A215018 Number of unsensed hypermaps with n darts and any genus. %H A215018 Timothy R. Walsh, <a href="http://www.info2.uqam.ca/~walsh_t/papers/GENERATING NONISOMORPHIC.pdf">Space-efficient generation of nonisomorphic maps and hypermaps</a> %H A215018 T. R. Walsh, <a href="https://cs.uwaterloo.ca/journals/JIS/VOL18/Walsh/walsh3.html">Space-Efficient Generation of Nonisomorphic Maps and Hypermaps</a>, J. Int. Seq. 18 (2015) # 15.4.3 %Y A215018 Cf. A090371, A118094, A214819, A214820, A057005; A214821-A214823, A215017, A215018. %K A215018 nonn,more %O A215018 1,2 %A A215018 _N. J. A. Sloane_, Aug 01 2012