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 A343091 #8 Jan 02 2022 14:35:00 %S A343091 1,8,67,520,3978,29988,224295,1667888,12352126,91196512,671717950, %T A343091 4938370736,36251576684,265787720908,1946696834735,14245828801024, %U A343091 104173927718694,761302443498960,5560564162774202,40595140188994224,296242813675800300,2161031983823779912 %N A343091 Number of rooted toroidal maps with n edges and no separating cycles or isthmuses. %H A343091 Andrew Howroyd, <a href="/A343091/b343091.txt">Table of n, a(n) for n = 2..100</a> %Y A343091 Row sums of A343090. %Y A343091 Cf. A343093. %K A343091 nonn %O A343091 2,2 %A A343091 _Andrew Howroyd_, Apr 04 2021