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 A239921 #11 Jan 18 2025 19:54:04 %S A239921 508233789579,104295987346126,11269592389125547,852994611088758224, %T A239921 50777879440443305426,2531246455428148382456,109880399953287962099588, %U A239921 4265557888300762164284822,150940131172496245801920542,4938911033961317567088755908,151101665358744941452325232448 %N A239921 Number of unrooted maps with n edges of (orientable) genus 7. %H A239921 Andrew Howroyd, <a href="/A239921/b239921.txt">Table of n, a(n) for n = 14..60</a> %H A239921 Timothy R. S. Walsh, Alain Giorgetti, Alexander Mednykh, <a href="http://dx.doi.org/10.1016/j.disc.2011.11.027">Enumeration of unrooted orientable maps of arbitrary genus by number of edges and vertices</a>, Discrete Math. 312 (2012), no. 17, 2660--2671. MR2935417. %Y A239921 Column k=7 of A379438. %Y A239921 Cf. A238357 (rooted), A348800 (unsensed). %Y A239921 Cf. A006386, A104595, A104596, A215019, A239918, A239919. %K A239921 nonn %O A239921 14,1 %A A239921 _Alain Giorgetti_, Mar 29 2014 %E A239921 a(23) onwards added by _Andrew Howroyd_, Jan 18 2025