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 A006432 M3166 #12 Apr 06 2021 21:12:43 %S A006432 0,3,60,650,5352,37681,239752,1421226,7996160,43219990,226309800, %T A006432 1154900708,5769562736,28312118565,136830224464,652656300122, %U A006432 3077631550512,14367512295274,66478236840680,305161336656876,1390869368495728,6298727501142218,28358908010334960 %N A006432 Number of tree-rooted planar maps with 3 vertices and n faces and no isthmuses. %D A006432 N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence). %H A006432 Andrew Howroyd, <a href="/A006432/b006432.txt">Table of n, a(n) for n = 1..100</a> %H A006432 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. %F A006432 a(n) seems to be divisible by n+1. - _Ralf Stephan_, Sep 01 2003 %Y A006432 A diagonal of A342987. %K A006432 nonn %O A006432 1,2 %A A006432 _N. J. A. Sloane_ %E A006432 Name clarified and terms a(13) and beyond from _Andrew Howroyd_, Apr 06 2021