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 A006387 M4237 #36 Jan 21 2025 21:29:28 %S A006387 0,0,1,6,40,320,2946,29364,309558,3365108,37246245,416751008, %T A006387 4696232371,53186743416,604690121555,6896534910612,78867385697513, %U A006387 904046279771682,10384916465797240,119522063788612992,1378014272286250059 %N A006387 Number of unsensed genus 1 maps with n edges. %D A006387 N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence). %H A006387 Evgeniy Krasko and Alexander Omelchenko, <a href="https://arxiv.org/abs/1712.10139">Enumeration of Unsensed Orientable Maps on Surfaces of a Given Genus</a>, arXiv:1712.10139 [math.CO], 2017. %H A006387 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 A006387 Timothy R. Walsh, <a href="http://dx.doi.org/10.1137/0604018">Generating nonisomorphic maps without storing them</a>, SIAM J. Algebraic Discrete Methods 4 (1983), no. 2, 161-178. %H A006387 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 A006387 Column k=1 of A379439. %Y A006387 Cf. A006300 (rooted), A006385 (planar), A006386 (sensed), A214814, A214815, A214816. %K A006387 nonn %O A006387 0,4 %A A006387 _N. J. A. Sloane_ %E A006387 a(12)-a(20) from _Evgeniy Krasko_, Sep 17 2017