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 A006427 M5105 #10 Apr 05 2021 11:45:31 %S A006427 20,1071,26320,431739,5494896,58677420,550712668,4681144391, %T A006427 36786186216,271221867098,1896796135920,12688048319278,81709791432384, %U A006427 509222462694582,3083998029716868,18213177504318335,105186858991413976,595499805083872458,3311524095424508480 %N A006427 Number of rooted toroidal maps with 4 vertices and n faces and no isthmuses. %D A006427 N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence). %H A006427 T. R. S. Walsh and A. B. Lehman, <a href="http://dx.doi.org/10.1016/0095-8956(75)90050-7">Counting rooted maps by genus. III: Nonseparable maps</a>, J. Combinatorial Theory Ser. B 18 (1975), 222-259. %Y A006427 A diagonal of A343092. %K A006427 nonn %O A006427 1,1 %A A006427 _N. J. A. Sloane_ %E A006427 Name clarified and terms a(9) and beyond from _Andrew Howroyd_, Apr 05 2021