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 A297880 #11 Jan 20 2025 20:23:44 %S A297880 0,0,0,0,0,0,0,0,7258,688976,37466297,1512650776,50355225387, %T A297880 1461269893538,38236656513725,922552326544030,20847359639841664, %U A297880 446290728182323620,9129236228868478458,179639607187998993180,3418366706444416598777 %N A297880 Number of unsensed genus 4 maps with n edges. %H A297880 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 A297880 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>. %Y A297880 Column k=4 of A379439. %Y A297880 Cf. A215402 (rooted), A215019 (sensed). %Y A297880 Cf. A006385, A006387, A214814, A214815, A214816. %K A297880 nonn %O A297880 0,9 %A A297880 _Evgeniy Krasko_, Jan 07 2018 %E A297880 a(20) added by _Andrew Howroyd_, Jan 20 2025