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 A215019 #27 Jan 18 2025 19:31:11 %S A215019 14118,1369446,74803564,3023693380,100692692173,2922359760376, %T A215019 76471600288836,1845089145736960,41694584320696782,892580319444417876, %U A215019 18258463136626650660,359279139700128276168,6836732826365623258492,126347598971804884131800,2275643837092089686415858 %N A215019 Number of unrooted maps with n edges of (orientable) genus 4. %H A215019 Andrew Howroyd, <a href="/A215019/b215019.txt">Table of n, a(n) for n = 8..45</a> %H A215019 Alexander Mednykh, Alain Giorgetti, Enumeration of genus four maps by number of edges. Ars Mathematica Contemporanea 4 (2011), 351-361. <a href="http://www.ams.org/mathscinet-getitem?mr=2842107">MR2842107</a> %H A215019 A. D. Mednykh and R. Nedela, <a href="http://www.savbb.sk/mu/articles/4_2004_nedela.pdf">Enumeration of unrooted maps with given genus</a>, preprint (submitted to J. Combin. Th. B). %H A215019 Timothy R. S. Walsh, Alain Giorgetti, Alexander Mednykh, Enumeration of unrooted orientable maps of arbitrary genus by number of edges and vertices. Discrete Math. 312 (2012), no. 17, 2660--2671. <a href="http://www.ams.org/mathscinet-getitem?mr=2935417">MR2935417</a> %Y A215019 Column k=4 of A379438. %Y A215019 Cf. A215402 (rooted), A297880 (unsensed). %Y A215019 Cf. A006386, A104595, A104596 (genus 3), A239918 (genus 5), A239919 (genus 6). %K A215019 nonn %O A215019 8,1 %A A215019 _N. J. A. Sloane_, Aug 01 2012 %E A215019 a(12) onwards added by _Andrew Howroyd_, Jan 18 2025