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 A099712 #12 Jan 12 2021 20:54:01
%S A099712 1,1,4,30,338,5169,101251,2446806,71043973,2429762734,96364601877,
%T A099712 4375603494478,225044659552381,12990629618136191,834981228656630494,
%U A099712 59346659738963806022,4635924974380060251228,395864230878802130389079,36773114396103232927777067
%N A099712 Consider the family of multigraphs enriched by the species of arborescences. Sequence gives number of those multigraphs with n labeled edges.
%D A099712 G. Paquin, Dénombrement de multigraphes enrichis, Mémoire, Math. Dept., Univ. Québec à Montréal, 2004.
%H A099712 Andrew Howroyd, <a href="/A099712/b099712.txt">Table of n, a(n) for n = 0..100</a>
%H A099712 G. Paquin, <a href="/A038205/a038205.pdf">Dénombrement de multigraphes enrichis</a>, Mémoire, Math. Dept., Univ. Québec à Montréal, 2004. [Cached copy, with permission]
%F A099712 E.g.f.: B(R(x)) where B(x) is the e.g.f. of A014500 and R(x) is the e.g.f. of A000169. - _Andrew Howroyd_, Jan 12 2021
%o A099712 (PARI) \\ R(n) is A000169 as e.g.f.; EnrichedGnSeq defined in A098620.
%o A099712 R(n)={-lambertw(-x + O(x*x^n))}
%o A099712 EnrichedGnSeq(R(20)) \\ _Andrew Howroyd_, Jan 12 2021
%Y A099712 Cf. A000169, A014500, A098620, A099713, A099714, A099715.
%K A099712 nonn
%O A099712 0,3
%A A099712 _N. J. A. Sloane_, Oct 26 2004
%E A099712 Terms a(12) and beyond from _Andrew Howroyd_, Jan 12 2021