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 A343093 #14 Jul 25 2025 09:00:56
%S A343093 1,14,159,1680,17147,171612,1696491,16631840,162090756,1572801142,
%T A343093 15210259585,146710561296,1412132981778,13569013500024,
%U A343093 130199055578307,1247825314752768,11947157409479180,114288613130155608,1092495810452593564,10436544808441964352
%N A343093 Number of rooted toroidal maps with n edges and no isthmuses.
%H A343093 Andrew Howroyd, <a href="/A343093/b343093.txt">Table of n, a(n) for n = 2..100</a>
%F A343093 Conjectural g.f.: A(x) = ( Sum_{n >= 1} (1/4)*binomial(4*n, n)*x^n )^2. - _Peter Bala_, Jul 24 2025
%Y A343093 Row sums of A343092.
%Y A343093 Cf. A224274, A343091.
%K A343093 nonn
%O A343093 2,2
%A A343093 _Andrew Howroyd_, Apr 04 2021