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 A098000 #14 Feb 12 2021 19:42:00
%S A098000 1,1,2,8,63,893,19714,597510,22903403,1056115331,56744710974,
%T A098000 3475626211316,238818544070905,18183183610029003,1519020289266947462,
%U A098000 138117136134012654182,13576724206357958780409,1434561741418662640589225,162136032834834405685977058,19516966563322659948894106704
%N A098000 Number of outerplanar graphs on n labeled nodes.
%H A098000 Andrew Howroyd, <a href="/A098000/b098000.txt">Table of n, a(n) for n = 0..200</a>
%H A098000 M. Bodirsky and M. Kang, <a href="http://www.informatik.hu-berlin.de/~bodirsky/publications/asymptoticBK.html">The asymptotic number of outerplanar graphs</a>.
%H A098000 S. R. Finch, <a href="http://www.people.fas.harvard.edu/~sfinch/">Planar graph growth constants</a>.
%H A098000 Steven R. Finch, <a href="/A097999/a097999.pdf">Planar graph growth constants</a> [Cached copy, with permission of the author]
%F A098000 Recurrence known, see Bodirsky and Kang.
%F A098000 Exponential transform of A097998. - _Andrew Howroyd_, Feb 12 2021
%o A098000 (PARI) seq(n)={Vec(serlaplace(exp(intformal(serreverse(x/exp((1 + 5*x - sqrt(1 - 6*x + x^2 + O(x^n)))/8))/x))))} \\ _Andrew Howroyd_, Feb 12 2021
%Y A098000 Cf. A097998, A097999, A111564, A005470.
%K A098000 nonn
%O A098000 0,3
%A A098000 _Steven Finch_, Sep 08 2004
%E A098000 a(0)=1 prepended and terms a(17) and beyond from _Andrew Howroyd_, Feb 12 2021